Fascism is of the Far Right. It favors Governmental totalitarian authority, inequality and strong nationalism.
The Far Left has embraced the methodology of Fascism without accepting the ideological goals. The Left has no complaint with being Anti-Democratic and Tyrannical (look at free speech on college campuses), but rather than looking to Government Totalitarian rule, it embraces "Mob Rule" to enforce its will. Like classical Fascists, the Left has no problems with unprincipled opportunism, happily exploiting any situation (like a school shooting) to its propaganda advantage. Any black man killed by any police officer must be "racism"; the fact that Blacks are 13% of the US population but commit 50% of all homicides cannot be a factor. Ideological Dishonesty is another tactic now embraced by the Left. A current example is the simultaneous complaints AGAINST Russian interference in US elections and the need to punish their enemies on the Right, while at the same time advocating that more illegal foreigners should be allowed to vote in US elections. Or the unacceptable tragedy of the death of even one school child, but the right of women to murder millions of unborn babies with Government funding.
So the modern Left has adopted the play book of the Far Right of WW2.
God help us all.