What did stalin do in the soviet union to make it a totalitarian state?

Totalitarianism is a form of government where the government has complete control over private and political lives of its citizens. Stalin monitored telephone lines, read mail and had spies everywhere. Those that opposed him were killed and his secret police patrolled Russia. All newspapers, magazines, etc had to be approved by the Soviet Union. Propaganda was also in every corner of Russia. By using propaganda, he could instill fear.
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Idon’t know i’m doing this for points