"Fascism began as a rejection of the idea that reason could be used to understand society and resulted, Sternhell argues, in the formation of a ‘new generation of intellectuals [which] rose violently against the rationalist individuals of liberal society’. These intellectuals absorbed the synthesised socialism and nationalism and thus created a new ideology, ‘a socialism without the proletariat’, which duly became fascism. This ideology Sternhell describes as being ‘a synthesis of organic nationalism and anti-Marxist socialism,…’"
https://en.wikiquote.org/wiki/Fascism's_relationship_with_other_political_and_economic_ideologies