Nark [verb] slang - to serve or behave as a spy or informer
Net [noun] a computer network
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Examples of government agencies intercepting Internet backbone traffic

Nantional Security Agency ( NSA )

NSA Spying on Americans - Electronic Frontier Foundation

Jewel v. National Security Agency

Room 641A

Professionalism/Mark Klein and Room 641A

Stumbling Into a Spy Scandal

New NSA Revelations: Inside Snowden's Germany File

Government Communications Headquarters ( GCHQ )

Optic Nerve: millions of Yahoo webcam images intercepted by GCHQ

GCHQ taps fibre-optic cables for secret access to world's communications

GCHQ intercepted foreign politicians' communications at G20 summits

Bundesnachrichtendienst ( BND )

Spying Together: Germany's Deep Cooperation with the NSA

The German Prism: Berlin Wants to Spy Too