Mo. Rev. Stat. § 589.557

The Interstate Commission may, by majority vote of the Members, initiate legal action in the United States District Court for the District of Columbia or, at the discretion of the Interstate Commission, in the Federal District where the Interstate Commission has its offices to enforce compliance with the provisions of the Compact, its duly promulgated Rules and By-laws, against any compacting state in default. In the event judicial enforcement is necessary the prevailing party shall be awarded all costs of such litigation including reasonable fees.