S.C. Code Ann. § 58-17-4060

If any person shall have contracted to deliver to any other person within this State certain commodities, no common carrier doing business in this State over whose road such commodities would be transported before delivery to the consignee shall interfere with the fulfillment of such contract between such shipper of freight and the proposed consignee, nor undertake to control or direct, or in any wise interfere with, the shipment of such commodities by the person who has contracted so to ship the same. To this end no common carrier doing business in this State over whose road such commodities would pass in transportation before delivery to the consignee in this State, when furnishing cars to the shippers thereof, may designate to what consignees freight loaded in such cars shall be consigned or in any way interfere with or seek to control the use of such cars by the shipper in making shipment to such consignee as he may desire to ship to or be under contract to ship to.