What leads the author to conclude that the soviet union can only be known as a police state

The world's first Marxist-Communist state would become one of the biggest and ... In a period known as the Red Terror, Bolshevik secret police

Explanation:

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norsemen from northern countries had made earlier journeys

answer: ensure protection from communism

explanation:

the north atlantic treaty was largely dormant until the korean war initiated the establishment of nato to implement it, by means of an integrated military structure: this included the formation of supreme headquarters allied powers europe in 1951, which adopted the western union's military structures and plans.