Title: Pinkerton's National Detective Agency records
Subjects: World War, 1914-1918, Private investigators, National security, Coal miners, Molly Maguires (Organization), Civil defense, Law enforcement, Crime, United States, Secret service, Labor unions, United States. Army of the Potomac, William J. Burns International Detective Agency, Sabotage, Espionage, History
Places: United States, Washington (D.C.), Pennsylvania
People: Butch Cassidy (b. 1866), Sundance Kid, Herman W. Mudgett (1861-1896), James P. McParland
Time periods: Civil War, 1861-1865