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The criminal case files consist of correspondence regarding the cases, reports from operatives, mug shots, reward notices, and wanted posters. Some of the case files also include histories of the cases, often written by Pinkerton employees after a case was completed. Most of the cases in Series 1 date from 1880 to 1930 but there are documents from 1870 through to 1958. The most famous file in this set is the Pinkerton_s pursuit of Butch Cassidy, the Sundance Kid (Harry Longabaugh), and the Wild Bunch Gang. In these files, documents cover bank robberies by Cassidy and his gangs in South Dakota, Idaho, and Nevada. There are also files on train robberies in Montana, Wyoming, and Colorado. Other case files in this series cover the gangs led by William Barrett, Sam Bass and Joel Collins, Charles Becker, Alfred Brady, Charles O. and William E. Brockway, William Burke, John Cannon, and James Carroll. Beyond the files on individual criminals and gangs, the collection also includes files on crimes committed in Alabama, Georgia, Illinois, Michigan, Missouri, Pennsylvania, Wisconsin, and Virginia.

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