What happened at the meeting that you would need the protection of uniformed police???
There was a heckler that wouldn't stand down when asked nicely, and there was some overall concern about possible violence. The room was packed, and spirits were high. The heckler was "escorted" from the room by two large men, and decided to leave after that.
I overheard some rather intolerant comments by some dyke-looking teacher afterwards, too.