Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 101, § 32

The deputy director, inspectors of standards and, within their respective jurisdictions, sealers or deputy sealers of weights and measures, constables and police officers shall arrest and prosecute every hawker and peddler, and transient vendor, who they may have reason to believe is violating any provision of this chapter. The chief of police, a police officer, or other official designated by a city council of a city or a board of selectmen of a town, may arrest and prosecute a person who engages in the sale of goods door-to-door for future delivery who such official has reason to believe is violating the provisions of section thirty-four.