How did USSR become communist?what happened to cause millions to die? same question for China?

i know millions were killed in both ussr and china by stalin and mao. but what led to it? what led to the countries becoming communist? what steps did the governmets do that led to communism? was it gradual? the current OCCUPY movement have elements that is marxist. i heard a speaker call himself a... show more i know millions were killed in both ussr and china by stalin and mao. but what led to it? what led to the countries becoming communist? what steps did the governmets do that led to communism? was it gradual?

the current OCCUPY movement have elements that is marxist. i heard a speaker call himself a 'marxist' and i saw a person holding a ussr flag, in youtube videos.

i want to compare how china and ussa became communist with whats happening today, so that we dont follow in the same steps.
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