I have a neighbor across the alley with a garage full of feral cats, at least 6 adults and unknown numbers of kittens. I've found several of the kittens in the alley half eaten by the other cats. Yup, it's that bad. The best I can get from the city officials is that they will come pick up any strays I can trap.
One neighbor has been trying to trap these cats all summer with no results. Apparently someone had tried earlier and had one success...but the other cats learned. I can hardly blame the cats, but I sure do blame the homeowner.
Heck, I can't even train my kestrel in the backyard because one of the cats was stalking us! Putting some serious thought to one of those high speed air rifles with the suppressor muzzle.