The philosopher Karl Popper was a strong critic of Marx, his system, and especially his reliance on historicism.

Karl Marx is often understood to have dismissed morality ... and that’s the morality in yours and let’s just fight it out,” ...

Sociologist Anderson (Marx at the Margins) offers a striking reappraisal of Karl Marx, drawing on the voluminous unpublished writings the thinker produced in his final 15 years of life.