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For detailed discussion of the scientific character of Marxism I recommend Kołakowski volume III chapter IV, which can be found in an old edition here https://ipfs.io/ipfs/bafykbzacebo552r2kndqxzvf2byvpag4dz2z3eb2dylr5ziqj2hnbptqciwhu?filename=Leszek%20Ko%C5%82akowski%20-%20Main%20Currents%20of%20Marxism_%20Its%20Origin%2C%20Growth%2C%20and%20Dissolution_%20Volume%203%2C%20The%20Breakdown.%203%20%281978%29.pdf