Once upon a time the NSA was so secret that its acronym was said to mean No Such Agency.
Today we know a great deal more about it, in part because of James Bamford, who in The Puzzle Palace (1982), a portrait of the agency, offered secrets so sensitive that the NSA attempted to block the book's publication.
Now, with The Shadow Factory: The Ultra-Secret NSA from 9/11 to the Eavesdropping on America Mr. Bamford takes a close look at the National Security Agency's performance just before 9/11 and after. (more)