Richard Engel presents a look at ISIS, the most brutal terrorist group in modern history. How do they recruit, and have they really been defeated? NBC News Chief Foreign Correspondent Richard Engel takes an in-depth look at how ISIS used ...See moreRichard Engel presents a look at ISIS, the most brutal terrorist group in modern history. How do they recruit, and have they really been defeated? NBC News Chief Foreign Correspondent Richard Engel takes an in-depth look at how ISIS used their military and reputation for brutality to capture a large territory in Iraq and Syria before clashing with the people who fought back.
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