Workers of the world, unite!

"Workers of the world, unite!" is a slogan from "The Communist Manifesto". It means that the working class should work together to get rid of capitalism and win the class war.
History.
The original phrase in German was "Proletarians of all countries, unite!".
In other languages.
This slogan was used as a motto by many communist and socialist states during the Cold War.
Motto of the Soviet Union.
In each Soviet republic, the same motto was used in the local language.