Herrin massacre
The Herrin massacre took place on June 21–22, 1922, in Herrin, Illinois, in a coal mining area during a nationwide strike by the United Mineworkers of America (UMWA). Although the owner of the mine originally agreed with the union to observe the strike, when the price of coal went up, he hired non-union workers to produce and ship out coal, as he had high debt in start-up costs.