Joseph Stalin was the dictator of Russia.
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Stalin
Immediately after Lenin, the USSR was ruled by a triumvirate of Joseph Stalin, Grigory Zinoviev and Lev Kamenev, while a power struggle over supremacy went on among Leon Trotsky, Nikolai Bukharin, Grigory Zinoviev and Stalin. Eventually Stalin won over the others and became sole dictator.
Josef Stalin was an atheist who saw believers as a threat to his power.
Joseph Stalin was the dictator of Russia.
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Stalin died in 1953; the Berlin Wall went up in about '60/61.
The downfall of Joseph Stalin was when he died in 1953. Stalin remained in power until his death.
Stalin
He died
Any threats to his power whatsoever worried Joseph Stalin.
He lost power at his death.
Stalin and the USThe Soviet Union never went to war against the US. (I hope you're not confusing him with Hitler). They indirectly fought as allies in both the Korean and Vietnam War, but niether of them directly attacked each other, and especially not Joseph Stalin (who wasn't even in power for the Vietnam War).
Immediately after Lenin, the USSR was ruled by a triumvirate of Joseph Stalin, Grigory Zinoviev and Lev Kamenev, while a power struggle over supremacy went on among Leon Trotsky, Nikolai Bukharin, Grigory Zinoviev and Stalin. Eventually Stalin won over the others and became sole dictator.
Stalin
Josef Stalin was an atheist who saw believers as a threat to his power.