The Roaring Twenties, the Great Depression, Prohibition, World War II, the Cold War, sixties counterculture, Kennedy's assassination, the civil rights movement, Vietnam - as the United States of the 20th century moved from monumental event to monumental event, one man was there; an ever-present man wielding immense power and a master of secrets. He was at the centre and at the fringes, both a household name and an enigma in the shadows.
John Edgar Hoover served as director of the Federal Bureau