From a Swedish standpoint, this is just nonsense. The Nordic countries (Sweden, Norway, Finland, Island and Denmark) are all in the top six most democratic countries in the world (according to The economist, England). These are were much socialist countries and most definitely democratic.
Then you have china, soviet and alike. Those are countries that call(ed) themself communist. I will argue that that's however mostly used as a label to legitimate the government and to obscure what they really are, in the same manner north Korea is formaly named the democratic people's republic of Korea (DPRK). Those countries does/did not operate as communist states the way that Marx and other political theorists imaginend them.