The vast and rapid modernization and industrialization of Russia at the start was a success, but my opinion is that Marxist-Leninism stopped in the USSR when Stalin seized the country and turned it into a crony dictatorship. I don’t believe that lasted long enough to be truly called a success, as it immediately fell to the authoritarianism it overthrew from the monarchy.
If you don’t think that Stalinism was the death of Marxist-Leninism in the USSR then the bread lines, famines, forced labor and relocation, imperial expansionism, etc. as broadly reported by those that lived there and lived through it are a product of socialism. I also believe that would count as failures of socialism and not proof of success.
I agree with you that the PRC is still nominally socialist, but believe they also went Stalinist instead of Marxist-Leninist. I would call them Stalinist Communist rather than socialist. I also do not think the juice was worth the squeeze with the number of dead in the revolution and aftermath, but there is no telling what an alternative would have looked like so that is just, like, my opinion man. I personally don’t consider China as a socialist success story, but instead another warning example for how easily Communism can be corrupted/captured from within.
I totally give you that Marxist-Leninism was the defining ideology of the 20th century, but I’d call it the fuse that lead to “Communism” the failed authoritarian ideology. Like the assassination of Archduke Ferdinand is to WWI. That is a hell of a lot more than Georgism ever got, to be sure, but would still say there has never been a successful Marxist country because they never remain Marxist for long.
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