What’s the difference between a fascist and an anarchist who does everything they can to kneecap the only viable left leaning political party in the US?

There’s no practical difference, just window dressing. They both cheer on oppression and pain for those suffering under Republicans.

Left is literally the opposite of authoritarian. You seem to be conflating a whole lot of ideas of terminology here. You sound like an ideological leftist who has been confused by the right's deliberate language-muddying.

Left is egalitarian. That takes many different forms.
Right is authoritarian. That also takes many different forms.

Authoritarianism (or vertical/hierarchical power structure) is THE defining characteristic of the right. "Auth-left" is an oxymoron meant to distract from the fact that wealth and power are one and the same.

State-imposed collectivism is left-leaning authoritarianism. It is the authoritarian and non-voluntary implementation of leftist economic policy. It is an extremely simple concept that I cant fathom how you aren’t able to grasp.

This is very easy. I provided the definitions of left and right.

Think about what you mean by "the state". Which definition does it fit?