When FBI Director J. Edgar Hoover reported to the Nixon White House in 1972 about the Bureau's surveillance of John Lennon, he began by explaining that Lennon was a "former member of the Beatles singing group." When a copy of this letter arrived in response to Jon Wiener's 1981 Freedom of Information request, the entire text was withheld--along with almost 200 other pages--on the grounds that releasing it would endanger national security. This book...