Film makers, musicians, artists, writers used to be able to make/write about any thing they wanted in the 1920s
At this time the only allowed art form was socialist realism
Anyone who created media not of this form was shot or sent to the gulags.
Simple, direct communist message
Making things look easy to understand - visually controlling art
All art had to portray communism / pro-country and be 'realistic' and easy to understand
The aim of this was so that communism and the soviet union's ideologies were inescapable, to inflict a psychological incapability on people making them unable to forget Stalin in any aspect of their life