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Fascism is the opposite of Marxism philosophically. Marxism is about progressing through history, fascism is about going back.
The fact that you would make this point makes me think you're either not smart or ignorant. Thus further expansion on the incompatibility of Marxian thought and fascism would be wasted energy. Here's a good link on why fascism wasn't a left wing movement(it's speaking to Jonah Goldberg's idiotic book Liberal fascism, but it still applies to this discussion) Introduction
Note: I use Marxism to refer to the concept of left socialism because that is the most common usage of the term socialism throughout the 20th century. Socialism itself is used in many contexts but the Marxian is the most common.