How did Socialist Realism limit the work of Soviet writers?

Socialist Realism, established as the sole official literary method in the Soviet Union in 1932, severely constrained writers by mandating that literature serve as a tool for state propaganda. Under the oversight of the Writers’ Union of the U.S.S.R., writers were forced to adhere to strict directives regarding style and content.1234

The limitations imposed on Soviet writers included:

• Ideological Conformity: Literature had to be "party-minded" and "typical," meaning writers were required to present a positive, optimistic view of socialist society while avoiding any "atypical" or unpleasant aspects of reality.12
• Mandatory Themes: Writers were expected to act as "engineers of human souls," focusing on narrow themes of current interest to the Communist Party, such as the building of a classless society.13
• Creative Suppression: Dissident, formally complex, or objective works were forbidden. Artistic expression was frequently sacrificed to party dogma, and even celebrated works were often forced to be rewritten to align with shifting party lines.325
• Professional Risk: The Writers' Union held the power to reprimand, punish, or expel writers who failed to follow these mandates, with expulsion often resulting in "literary death".42