diff --git a/src/abstractions/api.service.ts b/src/abstractions/api.service.ts
index 82385569..6600b8cc 100644
--- a/src/abstractions/api.service.ts
+++ b/src/abstractions/api.service.ts
@@ -128,6 +128,7 @@ export abstract class ApiService {
     postCollection: (organizationId: string, request: CollectionRequest) => Promise<CollectionResponse>;
     putCollection: (organizationId: string, id: string, request: CollectionRequest) => Promise<CollectionResponse>;
     deleteCollection: (organizationId: string, id: string) => Promise<any>;
+    deleteCollectionUser: (organizationId: string, id: string, organizationUserId: string) => Promise<any>;
 
     getGroupDetails: (organizationId: string, id: string) => Promise<GroupDetailsResponse>;
     getGroups: (organizationId: string) => Promise<ListResponse<GroupResponse>>;
@@ -135,6 +136,7 @@ export abstract class ApiService {
     postGroup: (organizationId: string, request: GroupRequest) => Promise<GroupResponse>;
     putGroup: (organizationId: string, id: string, request: GroupRequest) => Promise<GroupResponse>;
     deleteGroup: (organizationId: string, id: string) => Promise<any>;
+    deleteGroupUser: (organizationId: string, id: string, organizationUserId: string) => Promise<any>;
 
     getOrganizationUsers: (organizationId: string) => Promise<ListResponse<OrganizationUserUserDetailsResponse>>;
 
diff --git a/src/services/api.service.ts b/src/services/api.service.ts
index 1452ea17..54a34f2d 100644
--- a/src/services/api.service.ts
+++ b/src/services/api.service.ts
@@ -398,6 +398,12 @@ export class ApiService implements ApiServiceAbstraction {
         return this.send('DELETE', '/organizations/' + organizationId + '/collections/' + id, null, true, false);
     }
 
+    deleteCollectionUser(organizationId: string, id: string, organizationUserId: string): Promise<any> {
+        return this.send('DELETE',
+            '/organizations/' + organizationId + '/collections/' + id + '/user/' + organizationUserId,
+            null, true, false);
+    }
+
     // Groups APIs
 
     async getGroupDetails(organizationId: string, id: string): Promise<GroupDetailsResponse> {
@@ -431,6 +437,11 @@ export class ApiService implements ApiServiceAbstraction {
         return this.send('DELETE', '/organizations/' + organizationId + '/groups/' + id, null, true, false);
     }
 
+    deleteGroupUser(organizationId: string, id: string, organizationUserId: string): Promise<any> {
+        return this.send('DELETE',
+            '/organizations/' + organizationId + '/groups/' + id + '/user/' + organizationUserId, null, true, false);
+    }
+
     // Organization User APIs
 
     async getOrganizationUsers(organizationId: string): Promise<ListResponse<OrganizationUserUserDetailsResponse>> {