During the past 30 years, extraordinary material released from American and Russian archives has enormously expanded our understanding about Soviet espionage directed at the United States and its allies during the 20th century. The Venona decryptions were the product of American decoding of KGB messages. The Vassiliev Notebooks were based on documents the KGB provided to a researcher as part of a negotiated book deal. The only material provided by a genuine spy was the Mitrokhin material,