Karl Marx

A thinker, I have never fully shared his ideas, as he promoted the violent rebellion of the proletariat and his ideas entailed the abolition of private property (which, in my view, is an inalienable right of man). The problem is not him, nor his ideas, but those who have "sought" to follow his ideas, imposing "communist" regimes (which are certainly not communist!) and failing to realize the utopia so dreamt of by the German. Still, the 4 is appropriate, as he was one of the most important thinkers of the second half of the 19th century.