In the Historiography of the Cold War, a controversy over negationist historical revisionism exists, where numerous revisionist scholars in the West have been accused of whitewashing the crimes of Stalinism, overlooking the Katyn massacre in Poland, disregarding the validity of the Venona messages with regards to Soviet espionage in the United States, as well as the denial of the Ukrainian Famine that took place during 1932–1933 (also known as denial of the Holodomor).