Far left is mostly also authoritarian. They say they want everyone to have the same rights but get angry or try to silence people that don't agree with their radical ways. I'm not talking about the left in general but the far left. As such they see it needed to achieve their goals, even if it official is equality for example.
Edit: Removed "Tankies definitely are authoritarian." They are kinda a weird case where they believe or say they believe in Marxist Leninist ideology but then support countries that dress as communist even if they are ruled by a small elite or are actually mostly capitalist. I believe they are kinda gullible far left with mostly a "US bad" sentiment so China and Russia must be good. They are not solely representative of far left authoritarianism