diff --git a/server/src/domain/handler.rs b/server/src/domain/handler.rs
index bec8186..0efc41f 100644
--- a/server/src/domain/handler.rs
+++ b/server/src/domain/handler.rs
@@ -34,7 +34,7 @@ impl From<String> for UserId {
     }
 }
 
-#[derive(PartialEq, Eq, Debug, Serialize, Deserialize)]
+#[derive(PartialEq, Eq, Debug, Clone, Serialize, Deserialize)]
 #[cfg_attr(not(target_arch = "wasm32"), derive(sqlx::FromRow))]
 pub struct User {
     pub user_id: UserId,
@@ -134,9 +134,19 @@ pub struct GroupId(pub i32);
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize, sqlx::FromRow)]
 pub struct GroupIdAndName(pub GroupId, pub String);
 
+#[derive(Debug, Clone, PartialEq)]
+pub struct UserAndGroups {
+    pub user: User,
+    pub groups: Option<Vec<GroupIdAndName>>,
+}
+
 #[async_trait]
 pub trait BackendHandler: Clone + Send {
-    async fn list_users(&self, filters: Option<UserRequestFilter>) -> Result<Vec<User>>;
+    async fn list_users(
+        &self,
+        filters: Option<UserRequestFilter>,
+        get_groups: bool,
+    ) -> Result<Vec<UserAndGroups>>;
     async fn list_groups(&self, filters: Option<GroupRequestFilter>) -> Result<Vec<Group>>;
     async fn get_user_details(&self, user_id: &UserId) -> Result<User>;
     async fn get_group_details(&self, group_id: GroupId) -> Result<GroupIdAndName>;
@@ -159,7 +169,7 @@ mockall::mock! {
     }
     #[async_trait]
     impl BackendHandler for TestBackendHandler {
-        async fn list_users(&self, filters: Option<UserRequestFilter>) -> Result<Vec<User>>;
+        async fn list_users(&self, filters: Option<UserRequestFilter>, get_groups: bool) -> Result<Vec<UserAndGroups>>;
         async fn list_groups(&self, filters: Option<GroupRequestFilter>) -> Result<Vec<Group>>;
         async fn get_user_details(&self, user_id: &UserId) -> Result<User>;
         async fn get_group_details(&self, group_id: GroupId) -> Result<GroupIdAndName>;
diff --git a/server/src/domain/sql_backend_handler.rs b/server/src/domain/sql_backend_handler.rs
index e8ee667..1b2c739 100644
--- a/server/src/domain/sql_backend_handler.rs
+++ b/server/src/domain/sql_backend_handler.rs
@@ -3,7 +3,7 @@ use crate::infra::configuration::Configuration;
 use async_trait::async_trait;
 use futures_util::StreamExt;
 use sea_query::{Expr, Iden, Order, Query, SimpleExpr};
-use sqlx::Row;
+use sqlx::{FromRow, Row};
 use std::collections::HashSet;
 
 #[derive(Debug, Clone)]
@@ -109,7 +109,11 @@ fn get_group_filter_expr(filter: GroupRequestFilter) -> SimpleExpr {
 
 #[async_trait]
 impl BackendHandler for SqlBackendHandler {
-    async fn list_users(&self, filters: Option<UserRequestFilter>) -> Result<Vec<User>> {
+    async fn list_users(
+        &self,
+        filters: Option<UserRequestFilter>,
+        get_groups: bool,
+    ) -> Result<Vec<UserAndGroups>> {
         let query = {
             let mut query_builder = Query::select()
                 .column((Users::Table, Users::UserId))
@@ -122,6 +126,26 @@ impl BackendHandler for SqlBackendHandler {
                 .from(Users::Table)
                 .order_by((Users::Table, Users::UserId), Order::Asc)
                 .to_owned();
+            let add_join_group_tables = |builder: &mut sea_query::SelectStatement| {
+                builder
+                    .left_join(
+                        Memberships::Table,
+                        Expr::tbl(Users::Table, Users::UserId)
+                            .equals(Memberships::Table, Memberships::UserId),
+                    )
+                    .left_join(
+                        Groups::Table,
+                        Expr::tbl(Memberships::Table, Memberships::GroupId)
+                            .equals(Groups::Table, Groups::GroupId),
+                    );
+            };
+            if get_groups {
+                add_join_group_tables(&mut query_builder);
+                query_builder
+                    .column((Groups::Table, Groups::GroupId))
+                    .column((Groups::Table, Groups::DisplayName))
+                    .order_by((Groups::Table, Groups::DisplayName), Order::Asc);
+            }
             if let Some(filter) = filters {
                 if filter == UserRequestFilter::Not(Box::new(UserRequestFilter::And(Vec::new()))) {
                     return Ok(Vec::new());
@@ -131,31 +155,48 @@ impl BackendHandler for SqlBackendHandler {
                 {
                     let (RequiresGroup(requires_group), condition) = get_user_filter_expr(filter);
                     query_builder.and_where(condition);
-                    if requires_group {
-                        query_builder
-                            .left_join(
-                                Memberships::Table,
-                                Expr::tbl(Users::Table, Users::UserId)
-                                    .equals(Memberships::Table, Memberships::UserId),
-                            )
-                            .left_join(
-                                Groups::Table,
-                                Expr::tbl(Memberships::Table, Memberships::GroupId)
-                                    .equals(Groups::Table, Groups::GroupId),
-                            );
+                    if requires_group && !get_groups {
+                        add_join_group_tables(&mut query_builder);
                     }
                 }
             }
 
             query_builder.to_string(DbQueryBuilder {})
         };
+        log::error!("query: {}", &query);
 
-        let results = sqlx::query_as::<_, User>(&query)
-            .fetch(&self.sql_pool)
-            .collect::<Vec<sqlx::Result<User>>>()
-            .await;
+        // For group_by.
+        use itertools::Itertools;
+        let mut users = Vec::new();
+        // The rows are returned sorted by user_id. We group them by
+        // this key which gives us one element (`rows`) per group.
+        for (_, rows) in &sqlx::query(&query)
+            .fetch_all(&self.sql_pool)
+            .await?
+            .into_iter()
+            .group_by(|row| row.get::<UserId, _>(&*Users::UserId.to_string()))
+        {
+            let mut rows = rows.peekable();
+            users.push(UserAndGroups {
+                user: User::from_row(rows.peek().unwrap()).unwrap(),
+                groups: if get_groups {
+                    Some(
+                        rows.map(|row| {
+                            GroupIdAndName(
+                                GroupId(row.get::<i32, _>(&*Groups::GroupId.to_string())),
+                                row.get::<String, _>(&*Groups::DisplayName.to_string()),
+                            )
+                        })
+                        .filter(|g| !g.1.is_empty())
+                        .collect(),
+                    )
+                } else {
+                    None
+                },
+            });
+        }
 
-        Ok(results.into_iter().collect::<sqlx::Result<Vec<User>>>()?)
+        Ok(users)
     }
 
     async fn list_groups(&self, filters: Option<GroupRequestFilter>) -> Result<Vec<Group>> {
@@ -486,6 +527,19 @@ mod tests {
             .unwrap();
     }
 
+    async fn get_user_names(
+        handler: &SqlBackendHandler,
+        filters: Option<UserRequestFilter>,
+    ) -> Vec<String> {
+        handler
+            .list_users(filters, false)
+            .await
+            .unwrap()
+            .into_iter()
+            .map(|u| u.user.user_id.to_string())
+            .collect::<Vec<_>>()
+    }
+
     #[tokio::test]
     async fn test_bind_admin() {
         let sql_pool = get_in_memory_db().await;
@@ -558,50 +612,70 @@ mod tests {
         insert_user(&handler, "bob", "bob00").await;
         insert_user(&handler, "patrick", "pass").await;
         insert_user(&handler, "John", "Pa33w0rd!").await;
+        let group_1 = insert_group(&handler, "Best Group").await;
+        let group_2 = insert_group(&handler, "Worst Group").await;
+        insert_membership(&handler, group_1, "bob").await;
+        insert_membership(&handler, group_1, "patrick").await;
+        insert_membership(&handler, group_2, "patrick").await;
+        insert_membership(&handler, group_2, "John").await;
         {
-            let users = handler
-                .list_users(None)
-                .await
-                .unwrap()
-                .into_iter()
-                .map(|u| u.user_id.to_string())
-                .collect::<Vec<_>>();
+            let users = get_user_names(&handler, None).await;
             assert_eq!(users, vec!["bob", "john", "patrick"]);
         }
         {
-            let users = handler
-                .list_users(Some(UserRequestFilter::UserId(UserId::new("bob"))))
-                .await
-                .unwrap()
-                .into_iter()
-                .map(|u| u.user_id.to_string())
-                .collect::<Vec<_>>();
+            let users = get_user_names(
+                &handler,
+                Some(UserRequestFilter::UserId(UserId::new("bob"))),
+            )
+            .await;
             assert_eq!(users, vec!["bob"]);
         }
         {
-            let users = handler
-                .list_users(Some(UserRequestFilter::Or(vec![
+            let users = get_user_names(
+                &handler,
+                Some(UserRequestFilter::Or(vec![
                     UserRequestFilter::UserId(UserId::new("bob")),
                     UserRequestFilter::UserId(UserId::new("John")),
-                ])))
-                .await
-                .unwrap()
-                .into_iter()
-                .map(|u| u.user_id.to_string())
-                .collect::<Vec<_>>();
+                ])),
+            )
+            .await;
             assert_eq!(users, vec!["bob", "john"]);
         }
+        {
+            let users = get_user_names(
+                &handler,
+                Some(UserRequestFilter::Not(Box::new(UserRequestFilter::UserId(
+                    UserId::new("bob"),
+                )))),
+            )
+            .await;
+            assert_eq!(users, vec!["john", "patrick"]);
+        }
         {
             let users = handler
-                .list_users(Some(UserRequestFilter::Not(Box::new(
-                    UserRequestFilter::UserId(UserId::new("bob")),
-                ))))
+                .list_users(None, true)
                 .await
                 .unwrap()
                 .into_iter()
-                .map(|u| u.user_id.to_string())
+                .map(|u| {
+                    (
+                        u.user.user_id.to_string(),
+                        u.groups
+                            .unwrap()
+                            .into_iter()
+                            .map(|g| g.0)
+                            .collect::<Vec<_>>(),
+                    )
+                })
                 .collect::<Vec<_>>();
-            assert_eq!(users, vec!["john", "patrick"]);
+            assert_eq!(
+                users,
+                vec![
+                    ("bob".to_string(), vec![group_1]),
+                    ("john".to_string(), vec![group_2]),
+                    ("patrick".to_string(), vec![group_1, group_2]),
+                ]
+            );
         }
     }
 
@@ -763,29 +837,13 @@ mod tests {
         // Remove a user
         let _request_result = handler.delete_user(&UserId::new("Jennz")).await.unwrap();
 
-        let users = handler
-            .list_users(None)
-            .await
-            .unwrap()
-            .into_iter()
-            .map(|u| u.user_id.to_string())
-            .collect::<Vec<_>>();
-
-        assert_eq!(users, vec!["hector", "val"]);
+        assert_eq!(get_user_names(&handler, None).await, vec!["hector", "val"]);
 
         // Insert new user and remove two
         insert_user(&handler, "NewBoi", "Joni").await;
         let _request_result = handler.delete_user(&UserId::new("Hector")).await.unwrap();
         let _request_result = handler.delete_user(&UserId::new("NewBoi")).await.unwrap();
 
-        let users = handler
-            .list_users(None)
-            .await
-            .unwrap()
-            .into_iter()
-            .map(|u| u.user_id.to_string())
-            .collect::<Vec<_>>();
-
-        assert_eq!(users, vec!["val"]);
+        assert_eq!(get_user_names(&handler, None).await, vec!["val"]);
     }
 }
diff --git a/server/src/infra/graphql/query.rs b/server/src/infra/graphql/query.rs
index 497f8f3..31f6312 100644
--- a/server/src/infra/graphql/query.rs
+++ b/server/src/infra/graphql/query.rs
@@ -5,6 +5,7 @@ use serde::{Deserialize, Serialize};
 type DomainRequestFilter = crate::domain::handler::UserRequestFilter;
 type DomainUser = crate::domain::handler::User;
 type DomainGroup = crate::domain::handler::Group;
+type DomainUserAndGroups = crate::domain::handler::UserAndGroups;
 use super::api::Context;
 
 #[derive(PartialEq, Eq, Debug, GraphQLInputObject)]
@@ -126,7 +127,7 @@ impl<Handler: BackendHandler + Sync> Query<Handler> {
         }
         Ok(context
             .handler
-            .list_users(filters.map(TryInto::try_into).transpose()?)
+            .list_users(filters.map(TryInto::try_into).transpose()?, false)
             .await
             .map(|v| v.into_iter().map(Into::into).collect())?)
     }
@@ -215,6 +216,15 @@ impl<Handler: BackendHandler> From<DomainUser> for User<Handler> {
     }
 }
 
+impl<Handler: BackendHandler> From<DomainUserAndGroups> for User<Handler> {
+    fn from(user: DomainUserAndGroups) -> Self {
+        Self {
+            user: user.user,
+            _phantom: std::marker::PhantomData,
+        }
+    }
+}
+
 #[derive(PartialEq, Eq, Debug, Serialize, Deserialize)]
 /// Represents a single group.
 pub struct Group<Handler: BackendHandler> {
@@ -239,9 +249,10 @@ impl<Handler: BackendHandler + Sync> Group<Handler> {
         }
         Ok(context
             .handler
-            .list_users(Some(DomainRequestFilter::MemberOfId(GroupId(
-                self.group_id,
-            ))))
+            .list_users(
+                Some(DomainRequestFilter::MemberOfId(GroupId(self.group_id))),
+                false,
+            )
             .await
             .map(|v| v.into_iter().map(Into::into).collect())?)
     }
@@ -365,21 +376,33 @@ mod tests {
 
         let mut mock = MockTestBackendHandler::new();
         mock.expect_list_users()
-            .with(eq(Some(UserRequestFilter::Or(vec![
-                UserRequestFilter::Equality("id".to_string(), "bob".to_string()),
-                UserRequestFilter::Equality("email".to_string(), "robert@bobbers.on".to_string()),
-            ]))))
-            .return_once(|_| {
+            .with(
+                eq(Some(UserRequestFilter::Or(vec![
+                    UserRequestFilter::Equality("id".to_string(), "bob".to_string()),
+                    UserRequestFilter::Equality(
+                        "email".to_string(),
+                        "robert@bobbers.on".to_string(),
+                    ),
+                ]))),
+                eq(false),
+            )
+            .return_once(|_, _| {
                 Ok(vec![
-                    DomainUser {
-                        user_id: UserId::new("bob"),
-                        email: "bob@bobbers.on".to_string(),
-                        ..Default::default()
+                    DomainUserAndGroups {
+                        user: DomainUser {
+                            user_id: UserId::new("bob"),
+                            email: "bob@bobbers.on".to_string(),
+                            ..Default::default()
+                        },
+                        groups: None,
                     },
-                    DomainUser {
-                        user_id: UserId::new("robert"),
-                        email: "robert@bobbers.on".to_string(),
-                        ..Default::default()
+                    DomainUserAndGroups {
+                        user: DomainUser {
+                            user_id: UserId::new("robert"),
+                            email: "robert@bobbers.on".to_string(),
+                            ..Default::default()
+                        },
+                        groups: None,
                     },
                 ])
             });
diff --git a/server/src/infra/ldap_handler.rs b/server/src/infra/ldap_handler.rs
index 1b039af..1ffe061 100644
--- a/server/src/infra/ldap_handler.rs
+++ b/server/src/infra/ldap_handler.rs
@@ -1,8 +1,8 @@
 use crate::{
     domain::{
         handler::{
-            BackendHandler, BindRequest, Group, GroupRequestFilter, LoginHandler, User, UserId,
-            UserRequestFilter,
+            BackendHandler, BindRequest, Group, GroupIdAndName, GroupRequestFilter, LoginHandler,
+            User, UserId, UserRequestFilter,
         },
         opaque_handler::OpaqueHandler,
     },
@@ -109,6 +109,8 @@ fn get_user_attribute(
     user: &User,
     attribute: &str,
     dn: &str,
+    base_dn_str: &str,
+    groups: Option<&[GroupIdAndName]>,
     ignored_user_attributes: &[String],
 ) -> Result<Option<Vec<String>>> {
     let attribute = attribute.to_ascii_lowercase();
@@ -124,6 +126,11 @@ fn get_user_attribute(
         "mail" => vec![user.email.clone()],
         "givenname" => vec![user.first_name.clone()],
         "sn" => vec![user.last_name.clone()],
+        "memberof" => groups
+            .into_iter()
+            .flatten()
+            .map(|id_and_name| format!("uid={},ou=groups,{}", &id_and_name.1, base_dn_str))
+            .collect(),
         "cn" | "displayname" => vec![user.display_name.clone()],
         "createtimestamp" | "modifytimestamp" => vec![user.creation_date.to_rfc3339()],
         "1.1" => return Ok(None),
@@ -179,17 +186,24 @@ fn make_ldap_search_user_result_entry(
     user: User,
     base_dn_str: &str,
     attributes: &[String],
+    groups: Option<&[GroupIdAndName]>,
     ignored_user_attributes: &[String],
 ) -> Result<LdapSearchResultEntry> {
     let dn = format!("uid={},ou=people,{}", user.user_id.as_str(), base_dn_str);
 
-    let expanded_attributes = expand_attribute_wildcards(attributes, ALL_USER_ATTRIBUTE_KEYS);
     Ok(LdapSearchResultEntry {
         dn: dn.clone(),
-        attributes: expanded_attributes
+        attributes: attributes
             .iter()
             .filter_map(|a| {
-                let values = match get_user_attribute(&user, a, &dn, ignored_user_attributes) {
+                let values = match get_user_attribute(
+                    &user,
+                    a,
+                    &dn,
+                    base_dn_str,
+                    groups,
+                    ignored_user_attributes,
+                ) {
                     Err(e) => return Some(Err(e)),
                     Ok(v) => v,
                 }?;
@@ -625,7 +639,16 @@ impl<Backend: BackendHandler + LoginHandler + OpaqueHandler> LdapHandler<Backend
                 UserRequestFilter::And(vec![filters, UserRequestFilter::UserId((*u).clone())])
             }
         };
-        let users = match self.backend_handler.list_users(Some(filters)).await {
+        let expanded_attributes =
+            expand_attribute_wildcards(&request.attrs, ALL_USER_ATTRIBUTE_KEYS);
+        let need_groups = expanded_attributes
+            .iter()
+            .any(|s| s.to_ascii_lowercase() == "memberof");
+        let users = match self
+            .backend_handler
+            .list_users(Some(filters), need_groups)
+            .await
+        {
             Ok(users) => users,
             Err(e) => {
                 return vec![make_search_error(
@@ -639,9 +662,10 @@ impl<Backend: BackendHandler + LoginHandler + OpaqueHandler> LdapHandler<Backend
             .into_iter()
             .map(|u| {
                 make_ldap_search_user_result_entry(
-                    u,
+                    u.user,
                     &self.base_dn_str,
-                    &request.attrs,
+                    &expanded_attributes,
+                    u.groups.as_deref(),
                     &self.ignored_user_attributes,
                 )
             })
@@ -903,7 +927,7 @@ mod tests {
         }
         #[async_trait]
         impl BackendHandler for TestBackendHandler {
-            async fn list_users(&self, filters: Option<UserRequestFilter>) -> Result<Vec<User>>;
+            async fn list_users(&self, filters: Option<UserRequestFilter>, get_groups: bool) -> Result<Vec<UserAndGroups>>;
             async fn list_groups(&self, filters: Option<GroupRequestFilter>) -> Result<Vec<Group>>;
             async fn get_user_details(&self, user_id: &UserId) -> Result<User>;
             async fn get_group_details(&self, group_id: GroupId) -> Result<GroupIdAndName>;
@@ -1070,15 +1094,21 @@ mod tests {
     async fn test_search_regular_user() {
         let mut mock = MockTestBackendHandler::new();
         mock.expect_list_users()
-            .with(eq(Some(UserRequestFilter::And(vec![
-                UserRequestFilter::And(vec![]),
-                UserRequestFilter::UserId(UserId::new("test")),
-            ]))))
+            .with(
+                eq(Some(UserRequestFilter::And(vec![
+                    UserRequestFilter::And(vec![]),
+                    UserRequestFilter::UserId(UserId::new("test")),
+                ]))),
+                eq(false),
+            )
             .times(1)
-            .return_once(|_| {
-                Ok(vec![User {
-                    user_id: UserId::new("test"),
-                    ..Default::default()
+            .return_once(|_, _| {
+                Ok(vec![UserAndGroups {
+                    user: User {
+                        user_id: UserId::new("test"),
+                        ..Default::default()
+                    },
+                    groups: None,
                 }])
             });
         let mut ldap_handler = setup_bound_handler_with_group(mock, "regular").await;
@@ -1101,9 +1131,9 @@ mod tests {
     async fn test_search_readonly_user() {
         let mut mock = MockTestBackendHandler::new();
         mock.expect_list_users()
-            .with(eq(Some(UserRequestFilter::And(vec![]))))
+            .with(eq(Some(UserRequestFilter::And(vec![]))), eq(false))
             .times(1)
-            .return_once(|_| Ok(vec![]));
+            .return_once(|_, _| Ok(vec![]));
         let mut ldap_handler = setup_bound_readonly_handler(mock).await;
 
         let request =
@@ -1114,6 +1144,42 @@ mod tests {
         );
     }
 
+    #[tokio::test]
+    async fn test_search_member_of() {
+        let mut mock = MockTestBackendHandler::new();
+        mock.expect_list_users()
+            .with(eq(Some(UserRequestFilter::And(vec![]))), eq(true))
+            .times(1)
+            .return_once(|_, _| {
+                Ok(vec![UserAndGroups {
+                    user: User {
+                        user_id: UserId::new("bob"),
+                        ..Default::default()
+                    },
+                    groups: Some(vec![GroupIdAndName(GroupId(42), "rockstars".to_string())]),
+                }])
+            });
+        let mut ldap_handler = setup_bound_readonly_handler(mock).await;
+
+        let request = make_user_search_request::<String>(
+            LdapFilter::And(vec![]),
+            vec!["memberOf".to_string()],
+        );
+        assert_eq!(
+            ldap_handler.do_search(&request).await,
+            vec![
+                LdapOp::SearchResultEntry(LdapSearchResultEntry {
+                    dn: "uid=bob,ou=people,dc=example,dc=com".to_string(),
+                    attributes: vec![LdapPartialAttribute {
+                        atype: "memberOf".to_string(),
+                        vals: vec!["uid=rockstars,ou=groups,dc=example,dc=com".to_string()]
+                    }],
+                }),
+                make_search_success(),
+            ],
+        );
+    }
+
     #[tokio::test]
     async fn test_bind_invalid_dn() {
         let mock = MockTestBackendHandler::new();
@@ -1199,23 +1265,29 @@ mod tests {
     async fn test_search_users() {
         use chrono::prelude::*;
         let mut mock = MockTestBackendHandler::new();
-        mock.expect_list_users().times(1).return_once(|_| {
+        mock.expect_list_users().times(1).return_once(|_, _| {
             Ok(vec![
-                User {
-                    user_id: UserId::new("bob_1"),
-                    email: "bob@bobmail.bob".to_string(),
-                    display_name: "Bôb Böbberson".to_string(),
-                    first_name: "Bôb".to_string(),
-                    last_name: "Böbberson".to_string(),
-                    ..Default::default()
+                UserAndGroups {
+                    user: User {
+                        user_id: UserId::new("bob_1"),
+                        email: "bob@bobmail.bob".to_string(),
+                        display_name: "Bôb Böbberson".to_string(),
+                        first_name: "Bôb".to_string(),
+                        last_name: "Böbberson".to_string(),
+                        ..Default::default()
+                    },
+                    groups: None,
                 },
-                User {
-                    user_id: UserId::new("jim"),
-                    email: "jim@cricket.jim".to_string(),
-                    display_name: "Jimminy Cricket".to_string(),
-                    first_name: "Jim".to_string(),
-                    last_name: "Cricket".to_string(),
-                    creation_date: Utc.ymd(2014, 7, 8).and_hms(9, 10, 11),
+                UserAndGroups {
+                    user: User {
+                        user_id: UserId::new("jim"),
+                        email: "jim@cricket.jim".to_string(),
+                        display_name: "Jimminy Cricket".to_string(),
+                        first_name: "Jim".to_string(),
+                        last_name: "Cricket".to_string(),
+                        creation_date: Utc.ymd(2014, 7, 8).and_hms(9, 10, 11),
+                    },
+                    groups: None,
                 },
             ])
         });
@@ -1559,19 +1631,24 @@ mod tests {
     async fn test_search_filters() {
         let mut mock = MockTestBackendHandler::new();
         mock.expect_list_users()
-            .with(eq(Some(UserRequestFilter::And(vec![
-                UserRequestFilter::Or(vec![
-                    UserRequestFilter::Not(Box::new(UserRequestFilter::UserId(UserId::new("bob")))),
-                    UserRequestFilter::And(vec![]),
-                    UserRequestFilter::Not(Box::new(UserRequestFilter::And(vec![]))),
-                    UserRequestFilter::And(vec![]),
-                    UserRequestFilter::And(vec![]),
-                    UserRequestFilter::Not(Box::new(UserRequestFilter::And(vec![]))),
-                    UserRequestFilter::Not(Box::new(UserRequestFilter::And(vec![]))),
-                ]),
-            ]))))
+            .with(
+                eq(Some(UserRequestFilter::And(vec![UserRequestFilter::Or(
+                    vec![
+                        UserRequestFilter::Not(Box::new(UserRequestFilter::UserId(UserId::new(
+                            "bob",
+                        )))),
+                        UserRequestFilter::And(vec![]),
+                        UserRequestFilter::Not(Box::new(UserRequestFilter::And(vec![]))),
+                        UserRequestFilter::And(vec![]),
+                        UserRequestFilter::And(vec![]),
+                        UserRequestFilter::Not(Box::new(UserRequestFilter::And(vec![]))),
+                        UserRequestFilter::Not(Box::new(UserRequestFilter::And(vec![]))),
+                    ],
+                )]))),
+                eq(false),
+            )
             .times(1)
-            .return_once(|_| Ok(vec![]));
+            .return_once(|_, _| Ok(vec![]));
         let mut ldap_handler = setup_bound_admin_handler(mock).await;
         let request = make_user_search_request(
             LdapFilter::And(vec![LdapFilter::Or(vec![
@@ -1595,12 +1672,15 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn test_search_member_of() {
+    async fn test_search_member_of_filter() {
         let mut mock = MockTestBackendHandler::new();
         mock.expect_list_users()
-            .with(eq(Some(UserRequestFilter::MemberOf("group_1".to_string()))))
+            .with(
+                eq(Some(UserRequestFilter::MemberOf("group_1".to_string()))),
+                eq(false),
+            )
             .times(1)
-            .return_once(|_| Ok(vec![]));
+            .return_once(|_, _| Ok(vec![]));
         let mut ldap_handler = setup_bound_admin_handler(mock).await;
         let request = make_user_search_request(
             LdapFilter::Equality(
@@ -1644,16 +1724,22 @@ mod tests {
     async fn test_search_filters_lowercase() {
         let mut mock = MockTestBackendHandler::new();
         mock.expect_list_users()
-            .with(eq(Some(UserRequestFilter::And(vec![
-                UserRequestFilter::Or(vec![UserRequestFilter::Not(Box::new(
-                    UserRequestFilter::Equality("first_name".to_string(), "bob".to_string()),
-                ))]),
-            ]))))
+            .with(
+                eq(Some(UserRequestFilter::And(vec![UserRequestFilter::Or(
+                    vec![UserRequestFilter::Not(Box::new(
+                        UserRequestFilter::Equality("first_name".to_string(), "bob".to_string()),
+                    ))],
+                )]))),
+                eq(false),
+            )
             .times(1)
-            .return_once(|_| {
-                Ok(vec![User {
-                    user_id: UserId::new("bob_1"),
-                    ..Default::default()
+            .return_once(|_, _| {
+                Ok(vec![UserAndGroups {
+                    user: User {
+                        user_id: UserId::new("bob_1"),
+                        ..Default::default()
+                    },
+                    groups: None,
                 }])
             });
         let mut ldap_handler = setup_bound_admin_handler(mock).await;
@@ -1686,14 +1772,17 @@ mod tests {
     #[tokio::test]
     async fn test_search_both() {
         let mut mock = MockTestBackendHandler::new();
-        mock.expect_list_users().times(1).return_once(|_| {
-            Ok(vec![User {
-                user_id: UserId::new("bob_1"),
-                email: "bob@bobmail.bob".to_string(),
-                display_name: "Bôb Böbberson".to_string(),
-                first_name: "Bôb".to_string(),
-                last_name: "Böbberson".to_string(),
-                ..Default::default()
+        mock.expect_list_users().times(1).return_once(|_, _| {
+            Ok(vec![UserAndGroups {
+                user: User {
+                    user_id: UserId::new("bob_1"),
+                    email: "bob@bobmail.bob".to_string(),
+                    display_name: "Bôb Böbberson".to_string(),
+                    first_name: "Bôb".to_string(),
+                    last_name: "Böbberson".to_string(),
+                    ..Default::default()
+                },
+                groups: None,
             }])
         });
         mock.expect_list_groups()
@@ -1763,14 +1852,17 @@ mod tests {
         use chrono::TimeZone;
         let mut mock = MockTestBackendHandler::new();
 
-        mock.expect_list_users().returning(|_| {
-            Ok(vec![User {
-                user_id: UserId::new("bob_1"),
-                email: "bob@bobmail.bob".to_string(),
-                display_name: "Bôb Böbberson".to_string(),
-                first_name: "Bôb".to_string(),
-                last_name: "Böbberson".to_string(),
-                ..Default::default()
+        mock.expect_list_users().returning(|_, _| {
+            Ok(vec![UserAndGroups {
+                user: User {
+                    user_id: UserId::new("bob_1"),
+                    email: "bob@bobmail.bob".to_string(),
+                    display_name: "Bôb Böbberson".to_string(),
+                    first_name: "Bôb".to_string(),
+                    last_name: "Böbberson".to_string(),
+                    ..Default::default()
+                },
+                groups: None,
             }])
         });
         mock.expect_list_groups()
diff --git a/server/src/infra/tcp_backend_handler.rs b/server/src/infra/tcp_backend_handler.rs
index 0dee16c..c6f8d4d 100644
--- a/server/src/infra/tcp_backend_handler.rs
+++ b/server/src/infra/tcp_backend_handler.rs
@@ -35,7 +35,7 @@ mockall::mock! {
     }
     #[async_trait]
     impl BackendHandler for TestTcpBackendHandler {
-        async fn list_users(&self, filters: Option<UserRequestFilter>) -> Result<Vec<User>>;
+    async fn list_users(&self, filters: Option<UserRequestFilter>, get_groups: bool) -> Result<Vec<UserAndGroups>>;
         async fn list_groups(&self, filters: Option<GroupRequestFilter>) -> Result<Vec<Group>>;
         async fn get_user_details(&self, user_id: &UserId) -> Result<User>;
         async fn get_group_details(&self, group_id: GroupId) -> Result<GroupIdAndName>;