def METHOD_NAME(self, request: Request, pk: str) -> Response:
    """Add user to group"""
    group: Group = self.get_object()
    user: User = (
        get_objects_for_user(request.user, "authentik_core.view_user")
        .filter(
            pk=request.data.get("pk"),
        )
        .first()
    )
    if not user:
        raise Http404
    group.users.remove(user)
    return Response(status=204)