La. R.S. 23:883

Any express or implied agreement or understanding, or practice between any employer and any labor union or labor organization whereby any agricultural laborer not a member of such union or organization shall be denied the right to work for an 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 of agricultural laborers, is hereby declared to be an illegal combination or conspiracy against public policy.