Definition of "Af"

Actually, they say, they get on quite well with the Afs. Just have a look around the country: no hostile glares or haughtiness when whites and blacks pass in the streets, none of the riots or strikes […]

1978, The Bridge, volumes 3-4, page 15

[…] the collapse of the white myths about the country: that it was a free society, that the “Afs” were happy and contented, that white culture was firmly rooted in a stable population, […]

2010, Roger Marston, Own Goals, page iv