Returned foreign fighters pose a significant terrorism threat to their home countries, but policies that aim to block the flow of foreigners frustrate some of these would-be jihadists. That frustration poses new problems.
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Editor's Note: The 2013 coup in Egypt did not, as the story so often goes in the West, lead to the end of the Islamist role in Egyptian politics. Rather, it led the new regime to crack down on the Muslim Brotherhood but accommodate a Salafi role in politics. Indeed, throughout the Middle East the Salafis have emerged as a potent political force, represented not only by radical groups like the Islamic State but also by a range of peaceful political and social organizations.