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Men holding signs reading 'Black Lives Matter' march in the 30th annual Kingdom Day Parade in honor of Dr. Martin Luther King Jr., January 19, 2015 in Los Angeles, California. 2015 is the 50th anniversary of the historic 1965 Selma to Montgomery Alabama freedom marches which played a pivotal role in the civil rights struggle for racial equality in the U.S. AFP PHOTO / ROBYN BECK
Men holding signs reading 'Black Lives Matter' march in the 30th annual Kingdom Day Parade in honor of Dr. Martin Luther King Jr., January 19, 2015 in Los Angeles, California. 2015 is the 50th anniversary of the historic 1965 Selma to Montgomery Alabama freedom marches which played a pivotal role in the civil rights struggle for racial equality in the U.S. AFP PHOTO / ROBYN BECK

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    Feisty exchange over Black Lives Matter debate

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Feisty exchange over Black Lives Matter debate

Former DEA agent David Katz and Black Lives Matter organizer Melina Abdullah spar over the ongoing tensions between the organization and police officers.

Feisty exchange over Black Lives Matter debate

Former DEA agent David Katz and Black Lives Matter organizer Melina Abdullah spar over the ongoing tensions between the organization and police officers.