Mass. Gen. Laws ch. 66 § 10B
The commissioner of the department of criminal justice information services, the department of criminal justice information services and its agents, servants, and attorneys including the keeper of the records of the firearms records bureau of said department, or any licensing authority, as defined in section 121 of chapter 140, shall not disclose any records divulging or tending to divulge the names and addresses of persons who own or possess firearms, rifles, shotguns, machine guns and ammunition therefor, as defined in said section 121 of said chapter 140, and names and addresses of persons licensed to carry or possess the same to any person, firm, corporation, entity or agency except criminal justice agencies as defined in section 167 of chapter 6 and except to the extent such information relates solely to the person making the request and is necessary to the official interests of the entity making the request.
The home address, personal email address and home telephone number of law enforcement, judicial, prosecutorial, department of youth services, department of children and families, department of correction and any other public safety and criminal justice system personnel, and of unelected general court personnel, shall not be public records in the custody of the employers of such personnel or the public employee retirement administration commission or any retirement board established under chapter 32 and shall not be disclosed, but such information may be disclosed to an employee organization under chapter 150E, a nonprofit organization for retired public employees under chapter 180 or to criminal justice agencies as defined in said section 167 of said chapter 6. The name, home address, telephone number and personal email address of a family member of any such personnel shall not be public records in the custody of the employers of the foregoing persons or the public employee retirement administration commission or any retirement board established under chapter 32 and shall not be disclosed. The home address, telephone number, personal email address or place of employment or education of victims of adjudicated crimes, of victims of domestic violence and of persons providing or training in family planning services and the name, home address, telephone number, personal email address or place of employment or education of a family member of any of the foregoing shall not be public records in the custody of a government agency which maintains records identifying such persons as falling within such categories and shall not be disclosed.
The home address, personal email address, home telephone number or mobile telephone number of an employee of an agency, executive office, department, board, commission, bureau, division or authority of the commonwealth, or of a political subdivision thereof, or of an authority established by the general court to serve a public purpose, in the custody of the governmental entity that maintains records identifying persons as falling within those categories shall not be public records; provided, however, that the information may be disclosed only to an employee organization whose written aims and objectives on file with the department of labor relations are to represent public employees in collective bargaining under chapter 150E or under chapter 150A for employees of a public authority subject to said chapter 150A by chapter 760 of the acts of 1962, a nonprofit organization for retired public employees under chapter 180, a criminal justice agency as defined in section 167 of chapter 6 or as otherwise required by law. The home address, personal email address, home telephone number or mobile telephone number of a family member of an employee that is contained in a record in the custody of a government agency that maintains records identifying employees of an agency, executive office, department, board, commission, bureau, division or authority of the commonwealth, or of a political subdivision thereof, or of an authority established by the general court to serve a public purpose shall not be a public record.
Mass. Gen. Laws ch. 66, § 10B