 Premiere al-Mahdi allowed FROLINAT, the guerilla movement trying to overthrow Chadian President François Tombalbaye, to establish rear bases in Darfur in 1969.However, FROLINAT factional infighting killed dozens within Darfur in 1971, leading Sudanese President Gaafar Nimeiry to expel the group.This was further complicated by the interest of new Libyan leader Muammar al-Gaddafi in the Chadian conflict.