Have you not noticed that the most populous country in the world is run by a self-identifying Communist Party?
And the USSR, #4 was Communist until it collapsed economically, not intellectually?
And the USSR, #4 was Communist until it collapsed economically, not intellectually?
I'd say it died off for generations because of active deplatforming of anyone involved rather than an open debate on the merits. For instance it was literally illegal to be a communist in the US due to the Communist Control Act of 1954.