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neverinNJ OP wrote

But it’s not the “bandits-and-railroads” phase of the Pinkertons’ history that most soured the firm’s reputation in the American public eye. Between 1877 and 1892, the Pinkertons were involved in 70 labor union strikes—including some of the biggest and most consequential of the Gilded Age. After Allan Pinkerton’s death in 1884, his sons William and Robert took over, and they doubled down on the project of providing what capitalists and industrialists needed in their struggles with labor. Pinkerton detectives infiltrated labor unions under cover of secrecy, and reported on their activities to employers; Pinkerton guards, acting as visible muscle, protected company property during strikes. The Pinkertons also provided strikebreakers (aka scabs) to fill in for companies when union workers walked out and protected those strikebreakers while they were working.

In a few instances, the Pinkertons killed people while clashing with strikers.