On May 19, 2012, 18 members of something called the Hoosier Anti-Racist Movement stormed the Ashford House Restaurant in Tinley Park, IL, armed with hammers and clubs. They attacked a small gathering of a group called the Illinois European Heritage Association.
The "anti-racist" political violence was caught on surveillance footage that was never made public -- until now. There is also footage of the attackers at a nearby restaurant before the assault. The faces of many are clearly identifiable, but only six of the 18 attackers have been arrested.
Here is a video with just the raw footage of the attack: http://youtu.be/EMw0bw_A26E.