That's not how Capitalism or fascism works. Capitalism is in constant decay, this decay leads to sharpening contradictions and fascism is deployed to protect Capitalist interests. Bernie would not end Capitalism, he may only slow it's rate of descent, not stop it or reverse it. A great work on fascism is Blackshirts and Reds. I can provide a longer Marxism intro reading list if you'd like, but Blackshirts is a great start.