How to deal with a threatening tenant?

[Stone Teran]

I have a tenant who is getting very threatening with me lately.  He gets near my face and asks for things and then he mumbles ghetto quasi-threats as he walks away.  He got behind on his rent so now I am kicking him out, which further aggravated the situation.  What's the best approach to avoid a physical fight?  This is a rough area so calling the police is a minimum 1-2 hour wait.