There was an abandoned house across the street from me and anytime a homeless person would start circling it and peering in windows and jiggling the door, I would call the local police.

Our local police are really nice. They would come out, ask the person some leading questions, then tell them the places that they could go for assistance, emphasizing the four places to within a ten minute walk that would house them for the night, and where to apply for more permanent housing.

But yeah, once they move in and receive mail, you're in for a rough one.