Mass. Gen. Laws ch. 186, § 25: Refusal of rental agreement or assistance based on termination of rental agreement under Sec. 24 or request for change of lock under Sec. 26 prohibited

Section 25. An owner shall not refuse to enter into a rental agreement, nor shall a housing subsidy provider deny assistance, based on an applicant having terminated a rental agreement under section 24 or based upon an applicant having requested a change of locks under section 26.