60 minutes. National security meltdown

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Summary

The CIA and FBI are drawing most of the criticism for failing to follow up on leads that might have prevented the attacks of September 11th. But another intelligence agency - bigger by far than eit...

The CIA and FBI are drawing most of the criticism for failing to follow up on leads that might have prevented the attacks of September 11th. But another intelligence agency - bigger by far than either the CIA or FBI - was also on the case: The National Security Agency. David Martin reports.

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