 Engels's earliest contribution to Marx's work was writing for the "Deutsch–Französische Jahrbücher", edited by both Marx and Arnold Ruge, in Paris in 1844.During this time in Paris, both Marx and Engels began their association with and then joined the secret revolutionary society called the League of the Just.The League of the Just had been formed in 1837 in France to promote an egalitarian society through the overthrow of the existing governments.