It is now clear beyond all reasonable doubt that Hitler and his associates believed they were socialists, and that others, including democratic socialists, thought so too.
.. His differences with the communists, he explained, were less ideological than tactical. German communists he had known before he took power, he told Rauschning, thought politics meant talking and writing. They were mere pamphleteers, whereas "I have put into practice what these peddlers and pen pushers have timidly begun", adding revealingly that "the whole of National Socialism" was based on Marx.
That is a devastating remark and it is blunter than anything in his speeches or in Mein Kampf ..
The claim that Hitler cannot really have been a socialist because he advocated and practised genocide suggests a monumental failure, then, in the historical memory. Only socialists in that age advocated or practised genocide, at least in Europe, and from the first years of his political career Hitler was proudly aware of the fact. Addressing his own party, the NSDAP, in Munich in August 1920, he pledged his faith in socialist-racialism: "If we are socialists, then we must definitely be anti-semites - and the opposite, in that case, is Materialism and Mammonism, which we seek to oppose." There was loud applause. Hitler went on: "How, as a socialist, can you not be an anti-semite?" The point was widely understood, and it is notable that no German socialist in the 1930s or earlier ever sought to deny Hitler's right to call himself a socialist on grounds of racial policy.