James A. Piazza

Editor’s Note: Terrorist groups often draw on ethnic or religious brethren in other countries. These communities raise money, provide arms, offer volunteers, lobby host governments and otherwise try to advance the terrorist cause. James Piazza of The Pennsylvania State University goes deep on diasporas. He identifies the ways in which they make a terrorism problem worse and why fighting terrorism requires countering the influence of militant diasporas.

Daniel Byman

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