James McParland
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James McParland was an Irish-American private detective and Pinkerton agent.
James McParland circa 1880s
James McParland, from the 1907 book The Confessions and Autobiography of Harry Orchard
Charlie Siringo
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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.
Siringo, c. 1890
Young Siringo
Cover of A Texas Cow Boy
Cover of A Cowboy Detective