H J P BOTHA
Perhaps I can explain as follows.  I think I know what the question is heading for.  When a person left the country and we received information that he was being trained abroad. (1) A docket was opened for illegally leaving the country.  A statement was then taken from the family to say that he was not at home, wasn't at home from a certain date.  A photograph was usually obtained and that was placed in a terrorist photograph album for circulation throughout the country.  All personal information was then obtained from the family and then information was constantly updated relating to this person's activities.
	When returned terrorists or arrested terrorists, or askaris gave information about such people, that was the also documented as to where that person might be.  When intelligence was received that a person was for instance in the vicinity of Durban or wherever, then as part of a routine investigation, the family would be visited to find out whether there'd been any contact.  If the information was more positive, the telephones of these homes would probably also be monitored to obtain more information.  If the information was to the effect that there was communication by post or by letter, then there would be a postal interception.  What I'm trying to say is that all possible intelligence gathering methods would have been used to monitor such a person's activities.