Authoritarianism is a feature of fascism, but it consists of much more than that. I think it's a political error to collapse all ideological opponents into a monolith, and it reduces your ability to see your enemy clearly and fight them effectively.

"Tankies" are not politically relevant. They only feature so heavily in anarchist polemics because they help us tell an easy fable about why the revolution failed. The US empire, however, is very relevant. It is the dominant institution that capitalism operates through. Anarchists can't afford to abandon an effective anticapitalist line of critique just because we can't stop seeing Stalinists lurking in the shadows.