Mass. Gen. Laws ch. 272 § 25
Any person owning, managing or controlling a restaurant, tavern or other place in any town, where food or drink is sold to the public to be consumed upon the premises or required to be licensed under chapter one hundred and thirty-eight, and any employee of such person, who provides, maintains, uses or permits the use of a booth, stall or enclosure of any description whatever which is so closed by curtains, screens or other devices that the persons within cannot at any time plainly be seen by other persons in such restaurant, tavern or other place, or in any division thereof, unless the enclosure is approved by the licensing authorities, and any person conducting such an establishment who maintains barred or barricaded entrances or exits thereto or other devices or appliances designed to impede access thereto by police officers, official inspectors and other officers entitled to enter the same, shall be punished by a fine of not less than fifty nor more than five hundred dollars or by imprisonment for not more than six months, or both.
Mass. Gen. Laws ch. 272, § 25