When linguist Sibel Dinez Edmonds showed up for her first day of work at the FBI, a week after the 9-11 attacks, she expected to find a somber atmosphere. Instead, she was offered cookies filled with dates from party bowls set out in the room where other Middle Eastern linguists with top-secret security clearance translate terror-related communications. She knew the dessert is customarily served in the Middle East at weddings, births and other celebrations, and asked what the happy occasion was. To her shock, she was told the Arab linguists were celebrating the terrorist attacks on America, as if they...