Sledge Hammer!

When a group of vigilante cops begin killing criminals who have gotten off due to legal technicalities, Hammer is assigned to infiltrate the group. To test his loyalty the rogues assign him the task of killing a female district attorney who is out to stop them. While this same D.A. tries to seduce Hammer in her home, Sledge learns that she is really the leader of the vigilantes and plans to kill him.