Any agreement between any employer and any labor union or labor organization whereby persons not members of such union or organization shall be denied the right to work for said employer, or whereby such membership is made a condition of employment or continuation of employment by such employer, or whereby any such union or organization acquires an employment monopoly in any enterprise, is hereby declared to be against public policy and illegal. [Ord. 4 § 6.2, 4/16/2015.]