Laborers are encouraged to unionize or otherwise engage in collective action in order to use the strength of their numbers to obtain better conditions.
Origin of workers-of-the-world-unite
The phrase, one of the most famous rallying cries of communism, comes from Karl Marx and Friedrich Engels's The Communist Manifesto; later the official motto of East Germany. A variation ("Workers of all lands, unite!") is inscribed on Marx's tombstone. The actual translation is more normally given as "Working men", or "Proletarians of all countries, unite!" (Proletarier aller Länder, vereinigt euch!).