The Pinkerton National Detective Agency was a security guard agency established in the United States in 1850 by Allan Pinkerton. Businessmen hired Pinkerton guards to keep strikers and suspected unionists out of their factories, the most notorious example being the Homestead strike of 1892, where hundreds of Pinkerton agents ended up killing several people by enforcing the strikebreaking measures of Henry Clay Frick (acting on behalf of Andrew Carnegie, who was abroad). The agency's logo, an eye embellished with the words "We Never Sleep" inspired the term "private eye." The "Pinkertons" were also used as guards in coal, iron and lumber disputes in Illinois, Michigan, New York and Pennsylvania, as well as the railroad strikes of 1877.

In the 1870s, Franklin B. Gowen, then president of the Philadelphia and Reading Railroad hired the agency to investigate the labor unions in the company's mines. A Pinkerton agent, James McParland, infiltrated the Molly Maguires using the alias James McKenna, leading to the downfall of this secret organization, ending years of violence, intimidation, and murder.

Pinkerton became a brand name for security guard services provided by Securitas AB, which in 2004 opted to retire the brand name permanently.

External links

• Pinkertons.com: current face of the Pinkerton Nat'l Detective Agency