ยง 2. Crimes
Section 5
2. Anyone who commits, in the case of an international armed conflict, one of the grave breaches of the Additional Protocol (I), concluded in Bern on 12 December 1977, to the Geneva Conventions of 12 August 1949, relating to the protection of victims of international armed conflicts (Netherlands Treaty Series 1980, 87), namely:
(d) the following acts if committed intentionally and in violation of the Geneva Conventions and Additional Protocol (I):
(iii) practices of apartheid
EDIT.