Massachusetts General Laws Part III. Courts, Judicial Officers and Proceedings in Civil Cases (Ch. 211-262) Ch. 258, § 11

If the judgment in any action brought under this chapter is in favor of the public employer, judgment for costs and execution thereon may issue in favor of the public employer, if the court finds the action brought by the claimant to have been frivolous or in bad faith, and final judgment on the action shall be a bar to any other or further action being brought on the same claim or subject matter.