GAO, Mali — The migrants arrive by coach. Diadie picks them out from the other travelers by their swollen backpacks and their apprehensive looks. Up until this point, most of their journeys’ have been legal. They come from Gambia and Senegal, Guinea and parts of southern Mali, and, as such, they hold passports that permit them visa-free travel within the 15-country regional bloc of the Economic Community of West African States (ECOWAS). The moment they make a deal with Diadie, however, they become illicit human cargo on one of the most dangerous smuggling routes on Earth. Diadie, who asked to be identified by only his first name, organizes transport for dozens of Europe-bound migrants each week. Wearing a black leather jacket and a maroon scarf wrapped around his head so that only his eyes and the bridge of his nose are visible, the 30-year-old coxeur — a middleman, or agent, who links migrants and smugglers — says Arab and Tuareg drivers crossing the Sahara to Algeria tell him how
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