Rose Isaak was an American citizen who served as the Executive Secretary of the American-Russian Institute, an organization run by the National Council of American-Soviet Friendship, which was a front organization for Soviet espionage during World War II. Isaak was a close associate of Louise Bransten, the CPUSA and Soviet operative who was the mistress of San Francisco KGB Rezident Grigory Kheifets. Isaak continued working with the American-Russian Institute up to the late 1950s.
- Comintern Apparatus Summary Report, 15 December 1944, FBI Comintern Apparatus file (FBI file 100-203581).
- Venona 294 KGB San Francisco to Moscow, 31 May 1945.
- John Earl Haynes and Harvey Klehr, Venona: Decoding Soviet Espionage in America (New Haven: Yale University Press, 1999), pg. 233.