Fraternity of peoples (Russian language: Дружба народов, druzhba narodov) is a concept advanced by Marxist social class theory. According to Marxism, nationalism is only a tool of the ruling class, used to keep the working class divided and thus easier to control and exploit. With the success of class struggle (i.e. the abolition of social classes), the natural brotherhood of all workers would make the idea of separate nations obsolete. The concept of the fraternity of the peoples is often opposed to "bourgeois cosmopolitanism".
The Tsarist Russian Empire was dubbed the "prison of the peoples" ("Тюрьма народов") by Lenin. The Soviet Union, which replaced the empire, proclaimed that the goal of its national policy was to forge a new national entity, the "Soviet people". Even though the USSR often claimed to make significant progress on that path, its dissolution put an end to that goal.