They may require suitable aid in the execution of their office in a criminal case, in the preservation of the peace, in the apprehending or securing of a person for a breach of the peace and in cases of escape or rescue of persons arrested upon civil process.
Mass. Gen. Laws ch. 37, § 13
Powers and duties; requisition of aid
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.