Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 18C, § 13

No person employed by or contracted by or volunteering for the office shall be subject to suit directly, derivatively or by way of contribution or indemnification for any civil damages under the laws of the commonwealth resulting from any act or omission performed during or in connection with the discharge of his duties within the scope of his employment or appointment, unless such act or failure to act was committed with gross negligence, maliciously, or in bad faith.