Karl Marx

“ In the same organ Marx published an elaborate defence of Engels in particular and communists in general from the strictures of Karl Heinzen, a radical republican politician. In both essays Marx ranges over a wide field, and develops his own views upon economic, political and historical questions.
The essay on Proudhon emphasizes the special merits of that writer as a pioneer of economic criticism, and forms a counterweight to Marx's devastating criticism of Proudhon in the "Poverty of Philosophy." ”