At War's end, the Russo–American Cold War emerged in the 1946–48 period, and American Communists found themselves at the political margins of U.S. society – such as being forced out of the leadership of trade unions; in turn, membership to the Communist Party of the U.S.A. declined. Yet, in 1948, American Communists did campaign for the presidential run of Henry A. Wallace, President Franklin D. Roosevelt's vice-president. In February 1956, to the 20th congress of the C.P.S.U., Nikita Khrushchev delivered the secret speech, "On the Cult of Personality and Its Consequences", denouncing Stalinism and the cult of personality for Josef Stalin; those political revelations ended the ideological relationship between many fellow-travelers in the West and the Soviet version of Communism.