It's Too Early For This!!!!

Ohmygod, yesterday was bananas. A teacher on my team who has been teaching for 25 years said she has never seen anything like it.
There were just hoards and hoards of children running in the hallway all day. During 2nd period, I had to leave my students to go break up a fight down the hall. None of the teachers in that part of the hallway came out to help, but all their kids did. There had to be 40 children standing there watching this fight. And me and another teacher from MY team. We didn't even know those kids! They were ripping out hair and screaming and clawing. I was exhausted when it was finally over. (Oh, and neither girl was suspended. They just had to go to "mediation" and talk it out.)
The kids aren't listening to us at all. Two solid, strong teachers on my team said they feel incompetent now. Every single thing they say to anybody turns into some screaming tantrum. "Go sit down, please."..."I AIN'T SITTING DOWN. GET OUT MY FACE. FUCK THIS SHIT." I haven't quite got to that part, but i feel like I'm talking to myself most of the time. Nobody is learning anything.
I spent my ENTIRE planning period yesterday standing outside my doorway "shooing" children away from my section of the hallway.
These are behaviors we saw in April and May of last year, not freaking September. The kids know they run this place. I was wrong when I said nothing had changed...now, there's not a single person they will listen to.