There are unconfirmed reports that the Sudanese military has also used chemical weapons. Numerous independent human rights groups and the United Nations have documented the government of Sudan's egregious human rights abuses in the north and the south. The government of Sudan bulldozes squatter slums on the outskirts of Khartoum which are the only homes available to tens of thousands of southern Sudanese refugees. It has destroyed Catholic schools and churches. Children are kidnapped from the streets and taken to remote camps where they are forced to change their name and their religion.
Slavery exists in Sudan.
The government has done nothing to stop it and most likely is quietly supporting it. Slave traders from the north sweep down into southern villages recently destabilized by fighting and kidnap women and children who are then sold for use as domestic servants, concubines or other purposes. This is real-life chattel slavery. It exists today - in the 20th century. I have been to Sudan three times since 1989 and have seen the conditions on the ground first-hand.