The break away of Riek Machar from SPLM/A resulted in Nuer ethnic group massacring Garang's ethnic Dinka from Bor in the Bor massacre in 1991.
Riek Machar's departure from SPLM/A led to a wave of violence against the Dinka people of Bor, specifically members of Garang's ethnic group, culminating in the tragic Bor massacre in 1991.