We associate this principle with health care professionals, and rightly so: We'd like our physicians to make us better.

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Although Westerners associate the Brotherhood with radicalism, in recent decades it has become largely a movement of urban, middle-class professionals.

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That's what Dateline NBC's Associate Producer Michelle Madigan learned at this year's DefCon, the largest gathering of hackers, crackers and security professionals in the world.

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