I have a requirement to get the current user's User-Group in Angular Application with Spartacus.
I saw, there are OOTB controllers inside Hybris but no way to call them from spartacus.
You have to use B2BUserService. There is a method designed to load and return that data:
getUserGroups(
orgCustomerId: string,
params: SearchConfig
): Observable<EntitiesModel<UserGroup>>