Manny books: they involved talking to over 100 of these intelligence operatives.
"Secret Power" by Nicky Hager, ISBN 0-908802-35-8. It describes in detail the ECHELON platform. It's one of the most important.
New Zealand people are quite unhappy at their place within ECHELON.
"Spyworld: Inside the Canadian and American Intelligence
Establishments" Mike Frost [NSA trained sigint person] ,Michel
Gratton
Mr. Frost describes missions in the U.S. where he was trained by the NSA
to handle domestic jobs that would be illegal for the NSA.
These books are quite damning, in a heavily documented way. This is an AMAZINGLY COMPREHENSIVE BOOK:
"Above the Law" David Burnham ISBN 0-684-80699-1
"The Secret War Against the Jews", Authors: John Loftus and
Mark Aarons ISBN 0-312-11057-X Don't let the title throw you: the
authors spoke with a great many intelligence people, and cleverly probed
NSA/CIA/FBI by submitting items for publication approval, and when they
censored somet

I know people at the NSA. The things that go on are truly terrifying. That's how I found out about Cyvielance as well.