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In the fall of 2001 envelopes carrying deadly Anthrax were delivered to U.S. Senate offices, network news divisions, and a tabloid newspaper. Five people were killed, many more infected and the nation was terrorized. Now, FRONTLINE takes a hard look at the FBI's investigation of the country's most notorious act of bioterrorism.
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FRONTLINE explores and illuminates the critical issues of our times - from business and health to social issues, politics and war. Watch Tuesdays 9/8c.

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