The SPLA-Nasir was a splinter faction of the Sudan People's Liberation Army (SPLA), a rebel group that fought in the Second Sudanese Civil War. Originally created as an attempt by the Nuer tribe to replace SPLA leader John Garang in August 1991, it gradually became coopted by the government. 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.