In their work The German Ideology, the founders of Marxism assert that the prerequisite of post-capitalist (defined by them as communist) society is the universal development of human abilities and all social relations. But then on the same page, contrary to this statement, it is alleged that the abolition of private property is not only highly topical but it is also an imperative history-making task. In Manifesto of the Communist Party, Marx and Engels explain that economic crises recurrently shaking capitalist society expose an apparent contradiction between the productive forces and the capitalist relations of production – therefore, these relations must be eliminated for the preservation of society. Nonetheless, the same treatise affirms that the bourgeoisie cannot exist without revolutionizing not only the productive forces but also the relations of production. But in this case it stands to reason to recognize that there is no conflict between productive forces and production relations, and, therefore, there is no crisis of the capitalist system, either. Paradoxes in the communist theory of Marxism stem not merely from erroneous conceptions but reveal the fact that Marxism as an ideology comes into conflict with its scientific social theory. Hence, these paradoxes disclose the relative independence of the social theory of Marxism from its ideological postulates.