A revolution in a democratic manner? We are taking about a violent armed revolution, right? For that, you need a military power structure, and big charismatic leaders to rally behind. There's no way a revolution would try to hold fair elections while they are fighting.
USSR and PRC had really bad checks and balances since they let dictators consolidate power and form cults of personality. You really think those are good examples of your point? Have you read entirely different histories than I have? Which books do you recommend then?
I was going to say something like This Soviet World or Russian Justice, but they are not actually history books. They are written from a contemporary standpoint. Pat Sloans Soviet Democracy is another contemporary book.
I'm sure cowbee will link you to Blackshirts and reds, that is a history book.
The USSR and PRC did not have dictatorships, this is a misunderstanding of the Soviet structure and the concept of the Mass Line. Not even the CIA believed the USSR to be a dictatorship. The USSR had a more democratic structure than the US: