So Lenin's most important contribution to revolutionary Marxism, in defense from revisionists like Kautsky, Bernstein and Co. is his detailed study on capitalist imperialism and petty-bourgeois corruption within the workers movement leading up to the inter-imperialist war (part 1) where these corrupt leaders chose a "lesser evil" side of imperialism to support.
Turning the imperialist war into a civil war, culminating in the successful
October revolution, a world-changing event. The Marxist movement then splits into two:
1. people who side with Lenin's concern on the side of the international revolutionary workers movement
2. the bourgeois elements in the leadership positions within the bureaucratic-reformist cancer metastasizing upon the workers movement that side with welfare gibs / their imperialist bourgeoisie / ethnic chauvinism etc.
Lenin dies prematurely and shortly after
self-described Leninists of numerous tendencies then go on to take completely contradictory positions with a proclivity to picking sides, in the inter-imperialist war (part 2).Notable examples: the left-communist "ultra-Leninists" around Bordiga, the left opposition "Bolshevik-Leninists" around Trotsky, the "Marxist-Leninists"* around Stalin.
Bordiga, Trotsky and Stalin believe the Axis imperialists are to be critically supported almost until its too late (i.e. for
several years leading into WWII relying on this "Leninist analysis").
Stalin then flip flops after almost having Moscow sacked by Nazi Germany and concedes to figures like Dimitrov, who argues in favor of picking the Allies side of the imperialist war and injecting the domestic Party and movement with millions of liberal-bourgeois elements*. "Marxism-Leninism" from this point on goes on to contain a blatant antagonistic contradiction at the heart of it that keeps erupting in a variety of ways continuously throughout the 20th century within the ideological disputes of Communist Party leadership.
* Mao and the CPC adopt the later Dimitrovist position of "Marxism-Leninism", diluting the domestic communist movement with these "progressive bourgeois" elements from the start, which will become a critical issue in domestic tumult later down the line.
By the mid 20th century, "Marxism-Leninism" erupts towards an overt social-imperial
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