In this Nov. 26, 2019, file photo, migrants are held in a van of the National Migration Institute after they were found in the cargo hold of a truck where dozens of Central American migrants were being smuggled, at an immigration checkpoint in Medellin de Bravo, Veracruz state, Mexico. Except for official border crossings, nearly every mile of river, desert and mountain along the U.S.-Mexican border is under the control of Mexico's organized crime rings, which decide who can cross and how much they will pay. (AP Photo/Felix Marquez) ** FILE **
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