The answer to the question above is Dmitri Shostakovich.
In the Soviet Union, the most famous composer to suffer state oppression was Dmitri Shostakovich.
Dmitri Shostakovich was a Russian composer and pianist who was regarded as one of the major composers in the 20th century. He achieved fame under Soviet Chief Mikhail Tukhachevsky's patronage although he has a complex relationship with the Soviet government.