From the moment of independence, tensions had already developed between Kabyle leaders and the central government, with the Socialist Forces Front (FFS) party of Hocine Aït Ahmed, strong in wilayas III and IV (Kabylie and Algiers), opposing the FLN's Political Bureau centred around the person of Ahmed Ben Bella, who in turn relied upon the forces of the border army group within the ALN commanded by Houari Boumediene. As early as 1963 the FFS called into question the authority of the single-party system, which resulted in two years of armed confrontation in the region, leaving more than four hundred dead, and most of the FLN leaders from Kabylia and the eastern provinces either executed or forced into exile.