def METHOD_NAME(self, organization_id):
    """ Controller for cancelling membership (not request). """
    context = {'model': model, 'session': model.Session,
               'user': c.user or c.author}
    try:
        toolkit.get_action('member_request_membership_cancel')(context, {"organization_id": organization_id})
        helpers.redirect_to('organizations_index')
    except NotAuthorized:
        abort(401, self.not_auth_message)
    except NotFound:
        abort(404, _('Request not found'))