Haymarket massacre. A bomb is thrown as Chicago police start to break up a rally for strikers at the McCormick Harvesting Machine Co. A riot erupts, 11 police and strikers die, mostly from gunfire, and scores more are injured - 1886
Four striking workers are killed, at least 200 wounded, when police attack ademonstration on Chicago?s south side at the McCormick Harvesting Machine plant. The Haymarket Massacre is to take place the following day - 1886
Chicago's first Trades Assembly, formed three years earlier, sponsors a general strike by thousands of workers to enforce the state's new 8-hour-day law. The one-week strike was unsuccessful - 1867