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 a demonstration 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