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America in the early twentieth century was rife with threats. Organized crime groups like the Mafia, German spies embedded behind enemy lines ahead of World War I, package bombs sent throughout the country, and the 1920 Wall Street bombing dominated headlines. Yet the story of the one man tasked with combating these threats has yet to be told. The Bulldog Detective: William J. Flynn and America's First War Against the Mafia, Spies, and Terrorists is the first book to tell the story of Flynn, the first government official to bring down the powerful Mafia, uncover a sophisticated German spy ring in the United States, and launch a formal war on terrorism on his way to becoming one of the most respected and effective law enforcement officials in American history.