I had sooo many chances to have him not only fired, but locked up for assault....The first week he was here, we had a 717 that the pilot had written up as "pulling to the right"...When I was arrived at the aircraft, he was there, and grabbed my up by my collar and said "Get up there and sign that chicken---- off, or you'll be sorry"....I was stunned, and shocked at the same time...and did'nt prosecute. Another time, I was up on an engine, and he was operating the crane. He swung left and nearly knocked me off the darn top of the engine...Man if I had those days back, I would have him arrested immediately...Who knows, maybe I'll have the opportunity again soon....