Mass. Gen. Laws ch. 120A, § 16: Judicial enforcement

Section 16. 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 wherein the interstate commission offices are located, to enforce compliance with the compact, its duly adopted 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 attorneys fees.