You are conflating communism with authoritarianism as is commonly done on purpose or by accident to invalidate it. Anarchists are also often Communists and they oppose democracy for its oppressive properties as compared to consensus building and free association, that's a critique of democracy from an even more libertarian perspective.
Socialists and Communists also believe in the democratization of the economy, so that a capitalist owner class doesn't get to dictate how our labor and resources are allocated.
If you truly believe in freedom, you might be interested in anarcho-communism or socialism. Liberal democracy isn't as free as you think.