Police are releasing the name of the man who was stabbed at a Providence bar.  Jeffrey Diehl was stabbed in the arm at Rock n' Rye Bar early Saturday morning.  Police say Diehl and his friends were involved in an altercation with a group of people wearing leather "biker vests" when the incident turned violent.  The victim doesn't know who the suspect was, and police are combing through surveillance footage to identify the person.  Diehl was briefly hospitalized for his injuries and released.