Marxism
Marxism is a doctrine intended to destroy civilization through undermining the fabric of society through private property, as it has been said it is the "doctrine of the destruction of nations".
In principle, Marxism is the institution of Talmudism in gentile countries.
Ideology
Diminished Importance of the People
"the doctrines (all negative) which place the center of life outside man" - Doctrine of Fascism by Benito Mussolini
Materialism
Fascism was largely a reaction to materialism.
"The conception is therefore a spiritual one, arising from the general reaction of the century against the materialistic positivism of the XIXth century" - Doctrine of Fascism by Benito Mussolini
Hence also the essential value of work, by which man subjugates nature and creates the human world (economic, political, ethical, and intellectual). - Doctrine of Fascism by Benito Mussolini
With the ethical being entirely decimated with Marxism and Materialism, as all things are interpreted as "relative"
Revolution
The Fascist idea of revolution is to look upon the past and build upon that which had worked while discarding that which failed, and such is mentioned by Hitler in Mein Kampf. This is opposed to Marxism, where tradition is entirely destroyed.