Mass. Gen. Laws ch. 149 § 33C
Notwithstanding any other provision of general or special law, any permanent employee of a city or town who is required to work in excess of his regular number of maximum hours per week as regulated by law, ordinance or by-law or rule shall be compensated for such additional hours of service at a rate of one and one half times his regular hourly compensation. The provisions of sections thirty-three A and thirty-three B shall not apply in any city or town which accepts this section.
This section shall take effect upon its acceptance in a city having a Plan E charter, by the affirmative vote of two thirds of all the members of the city council, and, in any other city by vote of the city council, subject to the provisions of its charter, and in a town by majority vote at the annual town meeting.
Mass. Gen. Laws ch. 149, § 33C