Marxism is broken up into 3 major components:
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Dialectical and Historical Materialism
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Critique of Capitalism via the Law of Value
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Advocacy for Revolutionary and Scientific Socialism.
Marxism-Leninism carries these 3 foundations forward, and analyzes Capitalism as it reaches Imperialism, as well as numerous expansions on the foundations of revolutionary theory and practice.
They are not “the same,” but the vast majority of Marxists are Marxist-Leninists, because Lenin’s application of Marxism to higher stages of Capitalism are invaluable to Marxism.
Stalin synthesized Marxism-Leninism, yes. He did so on the basis of Lenin’s theoretical advancements on Marxism. Stalin himself wasn’t that much of a theoretician, hence why it’s Marxism-Leninism, though Stalin has a few works under his belt. Yes, the Stalin. You’re free to read my introductory reading list if you want to learn more about Marxism.
Secondly, you have no idea what you’re talking about if you’re pretending Lenin came up with the idea of revolution and using the Dictatorship of the Proletariat to suppress fascists and the bourgeoisie. Such ideas came from Marx and Engels, who always advocated for revolution. From Marx:
“We have no compassion and we ask no compassion from you. When our turn comes, we shall not make excuses for the terror.”
I suggest you take the advice of @Edie@lemmy.ml and read up on Marxist theory and history before speaking nonsense from a pedestal.