federal agent/secret agent

Then, of course, is the Defense Signals Directorate (DSD) which is the Aussie version of the USA's National Security Agency (NSA). Among other things, they gather intelligence from the 'Echelon' network, which is a worldwide satellite listening system, recording and analysing just about every electronic (telephone) conversation on the planet, and assessing it for threat.

I suppose you'd get the odd juicy conversation, but imagine having to monitor "Yes, Aunt Gladys, the cat's well. No, Aunt Gladys, the geranium's died..." all day long! you'd pretty quickly go potty, I think!

http://www.dsd.gov.au

Jason