Way past time to let a “friend” go in and beat the living crap out of the squatter. Not even close to kidding. Make the turd hurt. Really hurt. And, of course, the “friend” is not known to the owner of the residence. Enough of this crap.
There’ll be a booming business for rent-a-friends.
Just bring back the Mafia, old-school style. If this stuff isn’t addressed, that’s exactly where we’re headed.