As a result, since 1917, Trotskyism as a political theory is fully committed to a Leninist style of democratic centralist party organisation, which Trotskyists argue must not be confused with the party organisation as it later developed under Stalin. Trotsky had previously suggested that Lenin's method of organisation would lead to a dictatorship, but it is important to emphasise that after 1917 orthodox Trotskyists argue that the loss of democracy in the Soviet Union was caused by the failure of the revolution to successfully spread internationally and the consequent wars, isolation and imperialist intervention, not the Bolshevik style of organisation.
Noted supporters of communism in the include singers Woody Guthrie , Pete Seeger , and Paul Robeson ; activists Angela Davis and Bill Ayers ; and noted spies Alger Hiss and the Rosenbergs . Many people openly supported communism in the 1920s and 1930s. But the 1950s saw the rise of Senator Joe McCarthy and the House Un-American Activities Committee (HUAC) , which launched hundreds of "investigations" in search of communist sympathizers. Although belief in communism is not a crime under . law, and these activities ultimately found very little evidence of a communist conspiracy, a substantial number of people suffered irreparable harm to their reputations, such as those on the Hollywood blacklist .