Karl Marx (1818-1883) was a German philosopher, economist, sociologist, journalist and revolutionary socialist. "Workers of the world unite! You have nothing to lose but your chains" was one of the most famous rallying cries from the Communist Manifesto (1848), written by Karl Marx & Friedrich Engels. It is a popular rendering in English of "Proletarier aller Lander vereinigt Euch!" which literally means "Proletarians of all countries unite!".