There is a memorable line at the end of the film classic, Casablanca. It is spoken by the Prefect of Police, Captain Renaud, to his men just after Rick (Humphrey Bogart) has shot Colonel Strasser. He says: “Colonel Strasser has been shot. Round up the usual suspects.” That rule or principle of action—of rounding up the usual suspects—writ large, captures the essence of the South African security system. The system may fairly be described as an elaborate mechanism designed to empower the security authorities to round up, or otherwise dispose of or deal with, suspects of their choice. The technique of empowerment is the conferment of statutory discretion upon some official or body to limit, suspend or terminate the basic liberties of any citizen or group of citizens. This discretion is usually couched in subjective terms.