I'm not aware of any communist country that didn't turn into an authoritarian state where the government imposed strict censorship and controls on the population.
When you look at why, it starts to make sense. Without strict economic controls black markets start to appear, where goods are bought and sold outside of the communist economy. Communist philosophy requires that black markets don't exist, because they allow for capitalism, private property, and a market economy. So Communism requires that these things be removed from society, which requires brute force.
Therefore taken from first principles, Communism is an authoritarian philosophy because it controls an individuals ability to buy, sell, and trade goods.
When you look at why, it starts to make sense. Without strict economic controls black markets start to appear, where goods are bought and sold outside of the communist economy. Communist philosophy requires that black markets don't exist, because they allow for capitalism, private property, and a market economy. So Communism requires that these things be removed from society, which requires brute force.
Therefore taken from first principles, Communism is an authoritarian philosophy because it controls an individuals ability to buy, sell, and trade goods.