Assault with intent to do bodily harm. The punks are so brave they travel in packs and wear masks.
In my state under 13A-11-59 it is unlawful for any person to have on his person a pistol while participating in or attending any demonstration. And if can be illegal to be within 1000 feet of such an event while in possession of a weapon if law enforcement has given a warning to stay away while armed.
I really am surprised we don't see more creative Weaponry in these encounters. I suspect this may happen though.