How can you explain the reasons for the tightening of the ideological press after the war?

How can you explain the reasons for the tightening of the ideological press after the war? How did this manifest itself in the development of literature, art and science?

The democratic impulse of the war in the USSR was suppressed by Stalin. The reason was that he was afraid of losing the sole power in the country. The population also supported the leader, since they believed that victory in the war was his merit. Attempts of people to change something were used by massive repressions, which took place in the 30s of the 20th century, when Stalin came to power. All those who disagree with the policy and ideology of the state were repressed.