Massachusetts Constitution Amendments Art. II, § 7

Nothing in this article shall be deemed to grant to any city or town the power to (1) regulate elections other than those prescribed by sections three and four; (2) to levy, assess and collect taxes; (3) to borrow money or pledge the credit of the city or town; (4) to dispose of park land; (5) to enact private or civil law governing civil relationships except as an incident to an exercise of an independent municipal power; or (6) to define and provide for the punishment of a felony or to impose imprisonment as a punishment for any violation of law; provided, however, that the foregoing enumerated powers may be granted by the general court in conformity with the constitution and with the powers reserved to the general court by section eight; nor shall the provisions of this article be deemed to diminish the powers of the judicial department of the commonwealth.