It would depend on whether you believe that Communism was a good idea or bad idea. If it was a good idea, then you'd prolly go with Lenin (despite all the bad things that he did). If its a bad idea, then Gorbachev was their greatest leader.
"It is well that war is so terrible, else we should grow too fond of it."
- General Robert E. Lee
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"It takes a big man to admit when he's wrong. I am NOT a big man." -Chevy Chase