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Goon squad
In the United States, a goon squad is a group of criminals or mercenaries commonly associated with either pro-union violence or anti-union violence[1] though they may be employed in other situations as well.[citation needed] In the case of pro-union violence, a goon squad may be formed by union leaders to intimidate or assault non-union workers, strikebreakers, or parties who do not cooperate with the directives of union leadership.[2] In the case of anti-union violence, goon squads are traditionally hired by employers as an attempt at union busting, and resort to many of the same tactics, including intimidation, espionage, and assault.[3]
During the labor unrest of the late 19th century in the United States, businessmen hired goon squads composed of Pinkerton agents to infiltrate unions, and as guards to keep strikers and suspected unionists out of factories. One of the best known such confrontations was the Homestead Strike of 1892, in which Pinkerton agents were called in to enforce the strikebreaking measures of Henry Clay Frick, acting on behalf of Andrew Carnegie, who was abroad; the ensuing conflicts between Pinkerton agents and striking workers led to several deaths on both sides. The Pinkertons were also used as guards in coal, iron, and lumber disputes in Illinois, Michigan, New York and Pennsylvania, as well as the Great Railroad Strike of 1877.
https://en.wikipedia.org/wiki/Goon_squad