Tankies are literal authoritarians. People say they’re “authoritarian communists,” which ignores they’re mostly Maoists or Stalinists, both of whom were closer to fascism than the left. It sort of ignores the basic premise of communism or even socialism to have a single authoritarian ruler. Kind of like how the Nazis called themselves socialists. I guess they were a workers’ party to start, but I don’t think you can reasonably conflate their ideology with the tenets of socialism.