"The Venona Secrets: Exposing Soviet Espionage and America's Traitors" by Herbert Romerstein and Eric Breindel. And "Venona: Decoding Soviet Espionage in America." By John Earl Haynes and Harvey Klehr. Two books not written by lunatics. If you Google "Venona" you'll find plenty more. The best example is the demand by Russian agents that Bettina Aptheker return the $7 million in cash that had been delivered to her and her father in suitcases when they were members of the Central Committee of the Communist Party USA. At the time Bettina was dean of women at University of California, Santa Cruz. She was responsible for bringing Angela Davis on board as a professor despite her have no credentials other than being a communist.