Did you know the official electronic eavesdropping goes back to the Civil War and the days of the telegraph?
A new NOVA documentary, 'The Spy Factory,' details how the NSA could have prevented the 9/11 attacks and how it has subsequently violated the privacy of millions of Americans. Joining us to talk about the NSA is journalist James Bamford.
If the National Security Agency (NSA) is listening to your phone calls and reading your emails, would you want to know about it?