William A Pinkerton, flanked by two express agents, c1870s-1880s (1954). Pinkerton and Pat Connell (left) and Sam Finley (Right). All three were agents of the Pinkerton Detective Agency founded by William's brother, Allan. A print from the Pictorial History of the Wild West, by James D Horan and Paul Sann, Spring Books, London, 1954.
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