Hitler did not have Mussolini's revolutionary socialist background... Nevertheless, he shared the socialist hatred and contempt for the 'bourgeoisie' and 'capitalism' and exploited for his purposes the powerful socialist traditions of Germany. The adjectives 'socialist' and 'worker' in the official name of Hitler's party ('The Nationalist-Socialist German Workers' Party') had not merely propagandistic value... On one occasion, in the midst of World War II, Hitler even declared that 'basically National Socialism and Marxism are the same.’

[T]he view that anti-Communism equals Fascism remained obligatory in countries subject to Communist censorship until the advent of Mikhail Gorbachev’s glasnost. It was prevalent also in foreign ‘progressive’ circles. Western scholars who had the temerity to link Mussolini or Hitler with Communism in any way or to depict their regimes as genuine mass movements risked verbal or other forms of harassment.