S.C. Code Ann. § 41-1-60

(1) The term "labor organization" means any organization of any kind, or any agency or employee representation committee or plan, in which employees participate and which exists for the purpose, in whole or in part, of dealing with employers concerning grievances, labor disputes, wages, rates of pay, hours of employment, or conditions of work. (2) It shall be unlawful for any carrier or shipper of property, or any association of such carriers or shippers, to agree to pay, or to pay, to or for the benefit of a labor organization, directly or indirectly, any charge by reason of the placing upon, delivery to, or movement by rail, or by a railroad car, of a motor vehicle, trailer, or container which is also capable of being moved or propelled upon the highways. (3) It shall be unlawful for any labor organization to accept or receive from any carrier or shipper of property, or any association of such carriers or shippers, any payment described in item (2) hereof. (4) Any person who agrees to pay, or who does pay, or who agrees to receive, or who does receive, any payment described in item (2) hereof shall be guilty of a misdemeanor and on conviction shall be fined not less than one hundred dollars nor more than one thousand dollars, or imprisoned for a period of not less than thirty days, nor more than one year, in the discretion of the court. Each act of violation, and each day during which such an agreement remains in effect, shall constitute a separate and distinct offense.