During the Soviet period, this term was very common. In the Soviet army, from members and marshals of the Central Military Commission to war chiefs and soldiers at the grass-roots level, they usually call each other "comrades-in-arms", but this word is not new, and it existed during the Russian Empire.

At that time, the translation was "brother" or "Baoze" (in fact, the word originally meant partner and colleague); During the Soviet period, it had the meaning of "comrade", and the title began to be universal, which made it have socialist connotation.

Russian davarich:

From the nest of the orange tree. Lao Mi is Lenin. Felix's full name is Felix Edmundovich Dzerzhinsky, and he was then the chairman of the All-Russian Committee for the Elimination of Counterrevolutionaries (Cheka). This organization is the predecessor of the KGB, and beria's full name is Lavrenti Pavlovich Beria. It is one of the main executors of Stalin's cleaning plan. I, on behalf of the proletarian workers and peasants alliance, that is, the broad masses of poor people at the bottom of society.