Summarize joseph stalin's rise to power and how his control expanded. why was it significant?

Stalin first became secretary of the Communist party. He then used his power to eliminate his competitors. He rose to power as dictator after Lenin's death. He used terror to control and once he had total control, he kept a tight of society and reigned and worked to revamp the economy.

This was significant because under Stalin, the Soviet Union transformed into an industrial and military superpower, but  because he ruled in terror, millions of his citizens died during his brutal reign.