Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 149, § 123

Inspectors, upon receipt of a notice signed by any person having knowledge of the facts that any factory or workshop subject to sections one hundred and nineteen and one hundred and twenty is not provided with the apparatus prescribed thereby, shall visit and inspect such factory or workshop, and for that purpose may enter therein during working hours; and if they ascertain that the owner, proprietor or manager thereof has failed to comply with said sections, they shall make complaint to a court or trial justice having jurisdiction, and cause such owner, proprietor or manager to be prosecuted.