No secret ?
Go and download as much data on "Echelon" for free from the CIA website public domain and also the EU parliament website public domain. Takes a while to find but its there.
Echelon was panned by the EU parliament years ago when the US was accused of allegedly using Echelon to gain the upper hand in international business deals, something the US strenuously denies.
Echelon has since been embraced by the EU and become an integral part of the EU security policy. Echelon used to scan the EU from British NSA bases.
Check the CIA and EU websites for this and more data on Echelon, its all there.