Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 143, § 3N

No person shall engage in gas fitting in the city of Boston without first making application to the building commissioner of said city and obtaining a permit therefor in accordance with the state building code; nor shall any person engage in gas fitting in any other city or town without first giving such notice as shall be prescribed by rules and regulations made by the board established under section twelve H of chapter twenty-five.  1

Whoever violates any provision of this section shall be punished by a fine of not more than five hundred dollars.

Rules and regulations adopted under section twelve H of chapter twenty-five may provide penalties for the violation thereof not exceeding five hundred dollars for any one offence and may provide that each day during any portion of which a violation is permitted to exist shall be a separate offence.