I want to know the answer to the following question:
Who has used programs such as Carnivore and NarusInsight to eavesdrop on the systems of internet service providers?
All the background I'm provided with is that "Even machines that operate as a closed system (i.e., with no contact to the outside world) can be eavesdropped upon via monitoring the faint electro-magnetic transmissions generated by the hardware; TEMPEST is a specification by the NSA referring to these attacks.". Is that enough to answer the question?