In "Spies: The Rise and Fall of the KGB in America" (2009), Klehr, Haynes, and Alexander Vassiliev, formerly of KGB, cite a KGB file Vassiliev saw in the Soviet Union that named "Isidor Feinstein, a commentator for the "New York Post"" in the 1930s, as being secret agent BLIN, who "entered the channel of normal operational work" in 1936. That a note listed BLIN as an agent of the KGB station in New York City, in 1938. Klehr, Haynes, and Vassiliev said that Stone "assisted Soviet intelligence on a number of tasks, ranging from doing some talent spotting, acting as a courier, by relaying information to other agents, and providing private journalist tidbits and data the KGB found interesting".