Socialist countries are not, the entire Scandinavian block are super socialist, and not authoritarian.

As for Communist countries, no one has actually implemented communism, only in name. Communism means the workers, not the state, control the means of production. The state controlling them allows for bad actors to seize control.

Authoritarianism has nothing to do with economic systems and everything to do with government structure. The Soviet bloc/China and other communist countries were authoritarian because the populous allowed their governments too much power. China is ultra capitalist now and they're as authoritarian if not more so.

People remember communist countries as more authoritarian because they're the more taught examples. Pinochet was a turbo capitalist and he was one of the most authoritarian rulers in history.

1. bc crackers got lucky 500 years ago by finding an entire hemisphere of free money, thus any "free commerce" after this date necessarily advantages crackers, and "authoritarian" (AKA anti-freecommerce) measures are necessary to avoid a horde of crackers (and one Iranian cuck) owning the entire oil deposits of Iran

2. bc crackers lie about everything including the 1st definition, and most people regardless of race only watch and listen to cracker media and learn cracker languages and spend their time in cracker echo-chambers, and also most people are just stoopid (way too stupid to be cognizant of this), so even when point #1 ceases to be true and commerce starts to benefit some Asian country who pulled themselves up against all titanic odds, you will still have billions of people agreeing with the worldwide cracker circlejerk

Marketing

some people have to be forced into being a part of a social system.

IE, there are people who would rather let others die in the streets than have their taxes raised. some people are just terrible human beings who believe 'i got mine, fuck everyone else' which is antithetical to socialism, and requires a heavy hand via regulation.