The five-month Homestead strike was begun in July 1892 by workers at Andrew Carnegie’s steelworks in Homestead, Pennsylvania.
It began when Carnegie refused to recognize the workers’ right to negotiate as a union.
Steelworks manager Henry Clay Frick brought in 300 Pinkerton guards to break the strike, but the workers drove them off in a bloody day of fighting on July 6.
The strike was finally broken by 8,000 state militiamen sent in by the governor.