Question: In which year did the French economist, socialist, theoretician and politician, who was a great influence on the German philosopher, economist and revolutionary socialist Karl Marx, participate in the Revolution?
Sentence (from "Karl Theodor Ferdinand Grün"): As a target of Marx' 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.
Relevant evidence: No