The poleetical slogan " Wirkers o the world, unite! " ( German : Proletarier aller Lander vereinigt Euch! , leeterally " Proletarians o aw kintras, unite! ") is ane o the maist famous rallyin cries o communism , foond in The Communist Manifesto (1848), bi Karl Marx an Friedrich Engels . A variation ("Wirkers o aw lands, unite") is an aa inscribit on Marx's tombstane.