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 eight hour
day law. The one-week strike was unsuccessful - 1867