Watch: An otherwise peaceful day of protest was marred by a spate of violence at a Seattle May Day protest. Video: Protesters dressed in "Black-Bloc" clothing smashed windows on Capitol Hill, bottles were thrown at police officers who in turn used pepper spray, and blast balls -- a small firework-like device that creates a flash and a modest dose of pepper spray when they would not disperse.

Michigan State Police say they were forced to use pepper spray and arrest at least four protesters who were opposing right to work legislation at the Michigan Capitol on Thursday. Michigan State Police Inspector Gene Adamczyk told the Detroit

Nine months and $76,000 later, the UC Davis officer accused of pepper spraying student protesters in November no longer works on the police force. Lt. John Pike and another officer were caught on cell phone video using pepper spray

Members of Occupy Los Angeles say that recent efforts to clean the "skid row" area of the city are actually a ploy to eventually rid the area of its homeless population, so that a powerful group of lobbyists can begin efforts to help their