Violence breaks out at the Salt Lake City, Utah stop of the Vans Warped Tour as hardcore punks and straightedge kids stomp their victim. In the mid 90's after numerous violent incidents, the Salt Lake City Police Department formally declared straightedge a violent gang. July 10, 1999. photo copyright - Trent Nelson. http://www.trenthead.comStraightedge kids stomp someone at the Vans Warped Tour.Straightedge kids stomp someone at the Vans Warped Tour.Straightedge kids stomp someone at the Vans Warped Tour.Straightedge chase security and some other guy into a building (guard in yellow jacket is holding a chair) at the Vans Warped Tour.