Communism, Fascism and National Socialism exacerbated and exploited popular resentments—class, racial and ethnic—to win mass support and to reinforce… - Richard Pipes

Even as the Fascist leader, Mussolini never concealed his sympathy and admiration for Communism: he thought highly of Lenin’s ‘brutal energy,’ and saw nothing objectionable in Bolshevik massacres of hostages. He proudly claimed Italian Communism as his child.

Moscow’s insistence that ‘fascism’ was the polar opposite of ‘communism’ found wide acceptance in socialist and liberal circles in the West.

For historians of the left even to raise the question of affinities between Soviet Communism and ‘Fascism’ is tantamount to conceding the possibility of a causal relationship. Since ‘Fascism’ for them is by definition the antithesis of socialism and Communism, no such affinities can be admitted and the sources of ‘Fascism’ must be sought exclusively in conservative ideas and capitalist practices. In the Soviet Union this trend went so far the under Lenin, Stalin and their immediate successor, it was forbidden to use the term “National Socialist.”