World used to be filled with revolutionary movements, and very few managed to grow past Dunbar's number or so before falling apart by everyone trying to out-politic everyone else.
Only very few that were extraordinarily loyal like Bolsheviks won. The primary difference between Bolsheviks and everyone else was their strong belief in strict loyalty to the party, whose decisions were to be absolutely binding upon all members.
Even after they started killing each other, very few defected the Party to join some other group.
Compare it with far more typical Slytherining in Kyrgystan where people keep joining, defecting, and plotting everyone against everyone else.
Most of the Trotskyist groups from the 1930s to the 1960s also adopted democratic centralism, but they infamously split all the time. Of course, Trotskyists are selected (amongst Leninists) as those willing to defect from the majority.
Update: This post has also been superseded - new comments belong in the latest thread.
The second thread has now also exceeded 500 comments, so after 42 chapters of MoR it's time for a new thread.
From the first thread: