Squatters Running A Very Loud Generator

So the gist of it is, I live in Brooklyn in a small apartment building. Nextdoor is a run down house with boarded up windows. Sometime in the summer some guys moved in and I haven’t had issues with them until recently. They started running a large generator in the back yard and it is a very loud very disruptive machine. All through the night sometimes during the day. I’ve tried to make complaints through 311, but the cops seem to not be able to do anything. I’ve spoken to him multiple times and conversations have been cordial until last night. Another neighbor started yelling at him so I poked my head out and said something as well. He started threatening the both of us. Called the cops but they never showed up. Is there anything I can do? I just want to be able to sleep.