how did Joseph Stalin's use of Secret Police and The Great Purges help him to maintain complete control over the Soviet Union ?

Soviet Union leader Vladimir Lenin, head of the Bolshevik party, died in ... Some claim the actions of Stalin were prompted by his desire to maintain authority as dictator. ... Meanwhile, the Soviet secret police, known as NKVD, conducted ... others believe Stalin helped strengthen and propel the Soviet Union

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answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44