Historian Christopher Andrew is the author of the new book "The Sword and the Shield: The Mitrokhin Archive and the Secret History of the KGB" (Basic books). The book is based on the documents smuggled out of the KGB archives by Vasili Mitrokhin, who worked for 30 years in the foreign intelligence archives of the KGB. In 1972 he began making notes and transcripts of the archives which he then smuggled out daily and hid. He defected to Britain in 1992.