Union violence in the United States

Union violence in the United States is physical force intended to harm employers, managers, replacement workers, union abstainers, sympathizers of the prior groups, or their families. On various occasions violence has been committed by unions or union members during labor disputes in the United States. When union violence has occurred, it has frequently been in the context of industrial unrest. Violence has ranged from isolated acts by individuals to wider campaigns of organised violence aimed at furthering union goals within an industrial dispute.

According to labor historians and other scholars, the United States has had the bloodiest and most violent labor history of any industrial nation in the world, and there have been few industries which have been immune. Researchers in industrial relations, criminology, and wider cultural studies have examined violence by workers or trade unions in the context of industrial disputes. The US government has examined violence during industrial disputes.