"You mean like Pinkerton's?"

     The Pinkerton National Detective Agency was a private U.S. security guard and detective agency established by Allan Pinkerton in 1850. During the labor unrest of the late 19th and early 20th century, the Pinkerton Agency was hired to provide agents to infiltrate unions, to supply guards to keep strikers and suspected unionists out of factories, and sometimes to recruit goon squads to intimidate workers. The company still operates as Pinkerton Consulting and Investigations.