**FILE** Frank Chikane, now an adviser to President Thabo Mbeki, in Wilderness near George, Cape Town, South Africa, in this Nov. 1, 2006 file photo. Adriaan Vlok, former police chief, and three other police officials are due to appear before Pretoria's High Court, Friday Aug. 17 2007 in connection with an alleged 1989 plot to murder Chikane by lacing his clothes with poison in one of the many sinister assassination methods employed by the white racist regime which dabbled with chemical and biological warfare in its bid to retain supremacy. (AP Photo/Obed Zilwa)