Who was a Russian dictator in the 20th century?

vladimir ilyich lenin died in 1924,stalin replaced him

Joseph Stalin is the dictator who reigned in 1924. It is true that Lenin lived until January 21, 1924, but by March 1923 he had had several serious strokes and was confined to a wheelchair unable to write or speak or give any kind of orders. Joseph Stalin ruled during Lenin's disability along with Lev Kamenev and Grigory Zinoviev. Lenin did not rule at all in 1924. After Lenin's death Stalin came up winner in the fight to succeed Lenin.