The U.S. Department of Justice is an institution of vast reach and power over the American people, with little oversight into its internal operations. This book examines the ways that attorneys general, FBI directors, federal prosecutors and other Justice Department officials have often abused their powers to achieve political goals rather than pursuing justice. Its warning remains as relevant in the digital post-9/11 era of the expanded national security state as it was in the days of J. Edgar Hoover.