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You are repeating false statements. There have been fully communist elected governments in Nepal, India, San Marino and probably more. In Spain we had a elected republican government run mainly by socialists and even an anarchist president.
The reason why most of them have been through a revolution is because they were declared illegal.
Nepal: Installed by force in the armed uprising against Rana rule in 1951
India: Never seized the means of production (or really got very powerful IMO)
San Marino: Attemped a coup and never seized the means of production.