In all seriousness, there's very little you can do. In a civilized world you would be able to have a chat and come to some arrangement with them. Alas, we only have the illusion of a civilized world.

I had a similar situation. When I moved into one house, I didn't realize that my neighbor behind me was a drug dealer. He went to prison. But that didn't stop the every week visit from the police to that same house. Then someone moved in a few houses away that was not a drug dealer, but liked to sit in his driveway, drunk out of his mind and blast his car stereo. Then there was...I could go on and on.

I made the painful decision to take the financial hit and move. It cost me a lot and I had to do a short sale on my house, but it was worth it. Now the only issues I have with my neighbors are humorous, not dangerous.

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Freedom isn't free.