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The FBI's vendetta against Martin Luther King, Jr.

06:29

The famous "I Have a Dream" speech not only put Martin Luther King, Jr. into the limelight, but it also made him a target of the FBI. Author of "The FBI and Martin Luther King JR," David Garrow, joins MSNBC’s Alex Wagner to shed light on what the FBI thought of Dr. King and the March on Washington 50 years.