The truth is now the lot of the loner with, unfortunately, very limited means of disseminating their ideas and influencing the masses. p. 695 - Alexander Zinoviev

The firmest proof that Marxism is not science but an ideology is Marxism’s attitude to the experience of the real communist (or socialist) societies.

The crisis of the communist economy has nothing in common with the economic crises of capitalist societies. At the basis of the capitalist crisis is anarchic production.[…] At the basis of the crisis of the communist economy are the very principles of its organization. […] This crisis is relative, in the sense that it is only perceived in comparison with the standard of living and technology of Western countries. The real crisis comes from the fact that we have moved away from communist methods applied in economics, to try to overcome difficulties and stagnation by capitalist methods. p. 107

According to a well-established opinion, kolkhozes were invented by Stalinist villains out of purely ideological considerations. Pure nonsense! The idea is not Marxist, it even has nothing to do with classical Marxism. Far from being a fruit of theory, it emerged in practical life as the product of a very real, nothing less than imaginary, communism. Ideology was only a means of justifying a historical evolution. p. 68