'I am a Socialist,' Hitler told Otto Strasser in 1930, 'and a very different kind of Socialist from your rich friend, Count Reventlow'.
No one at the time would have regarded it as a controversial statement. The Nazis could hardly have been more open in their socialism, describing themselves with the same terminology as our own SWP: National Socialist German Workers' Party.
Almost everyone in those days accepted that fascism had emerged from the revolutionary Left. Its militants marched on May Day under red flags. Its leaders stood for collectivism, state control of industry, high tariffs, workers' councils. Around Europe, fascists were convinced that, as Hitler told an enthusiastic Mussolini in 1934, 'capitalism has run its course'.
One of the most stunning achievements of the modern Left is to have created a cultural climate where simply to recite these facts is jarring. History is reinterpreted, and it is taken as axiomatic that fascism must have been Right-wing, the logic seemingly being that Left-wing means compassionate and Right-wing means nasty and fascists were nasty. You expect this level of analysis from Twitter mobs; you shouldn't expect it from mainstream commentators.