Among those tools is the science of group dynamics, which can take several forms. One of the better-known ones is the "Delphi Technique" - a dishonest use of the discussion forum where a person claiming to be an independent "facilitator" is really an interested party who subtly directs like-minded group members against dissidents.
Another is the employment of unearned guilt as a weapon of shame in a public setting. If you have a Jewish mother like I do, you'll understand that one implicitly.
Juan Williams, for his part, is viewed by many on the Left as a traitor simply because he works at FOX News, regardless of the fact that he is most frequently a doctrinaire liberal (albeit one who occasionally displays a flash of insight and logic).
Got a joke for you...
A Jewish mother bought her son two shirts for his birthday.
To show how much he appreciated the gift, he put one of them on.
His mother then said “What? Don’t you like the other one?”