Charles Angelo Sartana Siringo was an American lawman, detective, bounty hunter, and agent for the Pinkerton National Detective Agency during the late 19th and early 20th centuries.
Pinkerton is an American private investigation agency and security company established around 1850 in the United States by Scottish-born American cooper Allan Pinkerton and Chicago attorney Edward Ruc
Pinkerton guards escort strikebreakers in Buchtel, Ohio, 1884
Frick's letter describing the plans and munitions that will be on the barges when the Pinkertons arrive to confront the strikers in Homestead