During the Second World War Pope again worked for the U.S. government, drawing upon his expertise in languages and cultures. He also became a champion of Russia at a time when it was not popular to do so. He was a trustee of the American-Russian Institute and a vice-president of the National Council for American-Soviet Friendship. He published a biography of the Russian diplomat Maxim Litvinov in 1943. After "Life" magazine listed Pope in April 1949 among people they considered to be Communist sympathizers, some patrons withdrew their support of the Asia Institute.