The main approach of the communists is to get people to think that they are being abused so a to destroy society and then after all is in ruins to come in and take over and establish their order. Originally that meant the factory workers, but at some point the peasants working at the farms  of the owners of the estates got included in what was called the proletariat. That is why the flag of the  USSR has both the hammer and the sickle.  Obviously the Russians began to realize almost immediately that to run a factory or do any kind of business and especially advancement in the arts and sciences takes "know-how" and that know how got to be valued in the USSR way above the proletariat.

[Why were the factory workers above the peasants in Marx? Because Capitalism was the stage of world history between the Feudal period and Communism.]