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

the most brilliant scientific popularizer of his generation ... to take sides in the great political battles of the time over ...

In this extraordinary work, Friedrich Engels, the lifelong collaborator with Karl Marx, describes the greatest accomplishment of Marxism—transferring socialism from the realm of abstract ...

Modern Socialism is, in its essence, the direct product of the recognition, on the one hand, of the class antagonisms existing in the society of today between proprietors and non-proprietors ...