def METHOD_NAME(self, request, org_id, group_id):
    """
    Bulk add group members.
    Permission checking:
    1. only admin can perform this action.
    """
    # resource check
    org_id = int(org_id)
    if not ccnet_api.get_org_by_id(org_id):
        error_msg = 'Organization %s not found.' % org_id
        return api_error(status.HTTP_404_NOT_FOUND, error_msg)
    # permission check
    group_id = int(group_id)
    if get_org_id_by_group(group_id) != org_id:
        error_msg = 'Group %s not found.' % group_id
        return api_error(status.HTTP_404_NOT_FOUND, error_msg)
    return SysAdminGroupMembers().METHOD_NAME(request, group_id)