The super-secretive National Security Agency has been quietly monitoring, decrypting, and interpreting foreign communications for decades, starting long before it came under criticism as a result of recent revelations about the Bush administration's warrantless wiretapping program. Now a forthcoming PBS documentary asks whether the NSA could have prevented 9/11 if it had been more willing to share its data with other agencies.Author James Bamford looked into the performance of the NSA in his 2008 book, The Shadow Factory, and found that it had been closely monitoring the 9/11 hijackers as they moved freely around the United States and communicated with Osama bin Laden's operations center in Yemen. The NSA had even tapped bin Laden's satellite phone, starting in 1996.
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