Watch the Surrealist Glass Harmonica, the Only Animated Film Ever Banned by Soviet Censors (1968)
Briefly

Despite censorship and pressure from the Communist government to adhere to certain Socialist ideals, Russian animation is incredibly diverse and eloquent.
Many animated Soviet films were expressly made for propaganda purposes but displayed a range of technical virtuosity combined with daring stylistic experiments.
Animated films served as a powerful tool for entertainment, allowing some level of artistic expression that circumvented strict censorship laws.
Throughout the existence of the Soviet Union, animation thrived even as other art forms faced severe repression.
Read at Open Culture
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