In the 50s, had a WWII-vet ex-Marine in my public school in a slightly rough area of NYC. Nobody messed with him.
He was famous for making disruptive kids bend over in front of the entire lunchroom (because lunch was their favorite time for harassing other children) and then kicking them in the backside while we all cheered.
It worked. Granted, a little harsh...but I betcha none of those kids ever went to jail, if only because he made them look ridiculous and we were laughing at them.
Former Marine.