Employment Law Questions? Ask an Employment Lawyer.
If you have proof of the altercation, then call the police. And, you can sue in civil court for assault and battery. But, if you're not physically harmed, your damages may be very small (maybe $1,000 -- enough to get the boss' attention).
If you don't have proof, then you're probably wasting your time, because in court, no proof = no case.
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