Jedi Heretics were Force-users that were not members of the Jedi Council and therefore independent of the Council teachings. They began went certain Jedi Knights disagreed with changes in the Jedi teachings and broke off. Jedi Heretics are known to keep their abilites secret and only use them in emergencies. Also contrary to Jedi teachings before Order 66, Jedi Hertics married and had children. In the aftermath of Order 66 many Jedi Heretics survived due to their clandestine nature, and it was difficult for the Empire to find and hunt them down. the most famous Jedi Heretic was Sgt. Nori Sunrider of the New Republic Army.