On this day in 1968 at the Democratic National Convention in Chicago, tens of thousands of protesters against the Vietnam War battle police in the streets.
Mayor Richard Daley responded by unleashing the Chicago police force. Thousands of policemen stormed into the crowd, swinging their clubs and firing tear gas as people watched at home on their TV.
It began an eight day protest that ended with roughly 650 people arrested. Reports differ on the number of people injured.