I don't know about your legal rights in terms of that. I would doubt you have that right, though; a judge would probably say that if you don't like it there, move. However, you do have a right to have something done about this problematic neighbor. If he's waving a knife around, he should be in jail. If the police aren't doing their jobs, I'd suggest speaking to the police chief. If he won't help, go higher, like the police superintendant. Go higher still, if need be. Get neighbors to rally together. Have them write letters, and post an article in the local newspaper, if necessary. There are several things you can do.