Karl Theodor Ferdinand Grün

Karl Theodor Ferdinand Grün (; 30 September 1817 – 18 February 1887), also known by his alias Ernst von der Haide, was a German journalist, philosopher, political theorist and socialist politician. He played a prominent role in radical political movements leading up to the Revolution of 1848 and participated in the revolution. He was an associate of Heinrich Heine, Ludwig Feuerbach, Pierre-Joseph Proudhon, Karl Marx, Mikhail Bakunin and other radical political figures of the era.

Although less widely known today, Grün was an important figure in the German ''Vormärz'', Young Hegelian philosophy and the democratic and socialist movements in nineteenth-century Germany. As a target of Marx's criticism, Grün played a role in the development of early Marxism. Through his philosophical influence on Proudhon, he had a certain influence on the development of French socialist theory. Provided by Wikipedia