We lived in a middle class neighborhood. I could stand in our front yard and point to a house of ill repute, a gambling den, and a street drug sales house.
We didn't have any personal interactions, but the drug house was raided at least once a week and we used to say that was out weekly block party. The ambulance wouldn't go there without a police escort.
Then the neighbor next door had eight kids that lived back and forth between that house and a house down the street. I never did figure out what that was all about. These were crawl space houses, 3 bed, 1 bath, 950 sq ft. They weren't really destructive, but borrowed food often and never replaced it until I finally "ran out", and if we left our garage door open would "borrow" tools without asking. They played basketball in our driveway after we asked them not to - huge liability! We had to take the goal down, so our son couldn't play when they came home. There were a few domestic disputes with the cops called, but no violence that reached us.
Mostly minor annoying things. I much prefer that to most of the stories I've read here on eHell, but it is kind of nice to tell about it.