The Government, the spies and Kim Dotcom – some have asked what the difference is between the GCSB and the SIS.
The SIS spies on locals. The GCSB uses the Waihopai Spy Base near Blenheim and is part of an international spy network looking offshore.
So what were the GCSB up to, why, who knew and why didn't anyone tell the Prime Minister?
Watch the video for John Campbell's full report.