Can someone explain how communism killed 100 million people?

Well according to many of you, politicians had nothing to do with it and 100 million people just spontaneously combusted.
Update: I won't bother arguing with the misinformed, but I'm trying to make a point. Ideologies themselves don't kill, PEOPLE kill.
Update 2: Baub- You just reinforced my point.
Update 3: Me- I know, but I'm trying to see what other people's explanation on how "communism" kills.
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