My freken neighbors keep shooting a gun in their back yard every night.?

I'm not one of those annoying neighbors who complains about your party on a Sat. Night but I live alone with my baby and the stupid ghetto *** neighbor that's connected to my back yard has been shooting a gun everynight for over 3 mons always at like 12 am. That guys also growing corn back there which makes it more creepy... Have called the cops several times and even saw the ghetto bird stake out the back yard after I called once, I'm scared to confront em WTF should I do?!