S.C. Code Ann. § 24-21-1170
(B) The courts and executive agencies in each compacting state shall enforce this compact and shall take all actions necessary and appropriate to effectuate the compact's purposes and intent. In any judicial or administrative proceeding in a compacting state pertaining to the subject matter of this compact which may affect the powers, responsibilities, or actions of the Interstate Commission, the Interstate Commission shall be entitled to receive all service of process in any proceeding and shall have standing to intervene in the proceeding for all purposes.