Some 14,000 building trades workers and laborers, demanding an eight-hour work day, gather at the Milwaukee Iron Co. rolling mill in Bay View, Wisc. When they approach the mill they are fired on by 250 National Guardsmen under orders from the governor to shoot to kill. Seven die, including 13-year-old boy - 1886

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