Mass. Gen. Laws ch. 53 § 19
On an application signed by twelve hundred voters in any senatorial district, or by two hundred voters in any representative district, asking for the submission to the voters in that senatorial or representative district of any question of instructions to the senator or representatives from that district, and stating the substance thereof, the attorney general shall upon request of the state secretary determine whether or not such question is one of public policy, and if such question is determined to be one of public policy, the state secretary and the attorney general shall draft it in such simple, unequivocal and adequate form as shall be deemed best suited for presentation upon the ballot. Upon the fulfilment of the requirements of this and the two following sections the state secretary shall place such question on the official ballot to be used in that senatorial or representative district at the next state election.
Mass. Gen. Laws ch. 53, § 19