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    Inside the mind of a mass-murderer

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Inside the mind of a mass-murderer

CNN's Hala Gorani, sitting in for Christiane Amanpour, speaks with Joshua Oppenheimer, director of "The Act of Killing."

Inside the mind of a mass-murderer

CNN's Hala Gorani, sitting in for Christiane Amanpour, speaks with Joshua Oppenheimer, director of "The Act of Killing."