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P. David Gaubatz, a former federal agent, is a U.S. State Department-trained Arabic linguist and counterterrorism specialist who has held the U.S. government's highest security clearances.Paul Sperry, a media fellow at Stanford University's Hoover Institution, is former Washington bureau chief for Investor's Business Daily, and author of Infiltration: How Muslim Spies and Subversives Have Penetrated Washington.