Semper in excremento, sole profundum qui variat.

[Wisemon]

Whatever you get from your neighbors isn't enough to justify that kind of treatment, especially if they're breaking the law. Call the cops on them, but try to arrange it so that the cops come when they're caught in the act (figure out their schedule). Also, if they are illegals, it will make it all the more satisfying if you can get them deported.