easy to fix...
Send an email to the local police chief, CC the governor of your state, your local congressman, and 1 or 2 local TV news stations with something like this:
"Last night (insert date), a friend and I were at a local bar named (name), (address) when a large group of white males walked in and became very loud and obnoxious. They constantly shouted "White Power" and "Nazi's Rule" and racial slurs at the other patrons. They struck and injured a patron while calling him (pick something), and then started to intimidate all the witnesses threatening harm to anyone that said he started it. They made "gun" gestures with their hands.
The proprietor and staff and most of the patrons complied, and my friend and I left the establishment as soon as possible. I am very much afraid that this group is moving into the neighborhood and they will continue threatening and assaulting people.
Something needs to be done before innocent people are hurt or killed by this gang of self proclaimed neo-nazis"
Once everyone on your email sees that it was CC'ed to news and governor, they will move all over this and bend over backward to seem 'proactive'. Take it straight to the top and the ball will get bigger while it rolls down hill.