Edit 2: Apparently Control Orders are related to preventative terrorist acts.
"Control orders have been part of Australian anti-terrorism legislation since December 2005. A control order is issued by a court (at the request of the Australian Federal Police) to allow obligations, prohibitions and restrictions to be imposed on a person, for the purpose of protecting the public from a terrorist act. The types of obligations, prohibitions and restrictions may include a curfew at a particular address, wearing of an electronic monitoring tag, restrictions on use of telecommunications, regular reporting to police, and a range of other measures. Two control orders have been issued in Australia to date, those applying to Jack Thomas and David Hicks.
-Parliament of australia website"