Marxists could be converted to national socialism, as indeed quite a number of them were, similarly, national socialism could sign treaties with Comm… - Zeev Sternhell

[Fascist ideology was] a variety of socialism which, while rejecting Marxism, remained revolutionary. This form of socialism was also, by definition, anti-liberal and anti-bourgeois, and its opposition to historical materialism made it the natural ally of radical nationalism.

In the form that it emerged at the turn of the century and developed in the 1920s and 1930s, the fascist ideology represented a synthesis of organic nationalism with the antimaterialist revision of Marxism. It expressed a revolutionary aspiration based on a rejection of individualism, whether liberal or Marxist, and it created the elements of a new and original political culture.

That is why so many Sorelians, like many people on the Left both before and after the war, slid into fascism. When these leftists of all shapes and colors came to the conclusion that the working class had definitely beaten a retreat, they did not follow it into this attitude. Their socialism remained revolutionary when that of the proletariat had ceased to be so. Having to choose between the proletariat and revolution, they chose revolution; having to choose between a proletarian but moderate socialism and a nonproletarian but revolutionary and national socialism, they opted for the nonproletarian revolution, the national revolution.