Protesters gather outside of the suburban Chicago ICE detention center in Broadview, Illinois, after a morning of violent confrontations between federal agents and activists, on September 19. | Dominic Gwinn/Middle East Images/AFP via Getty Images When a shooter opened fire on an immigration facility in Dallas last week, killing at least one migrant detainee in the process, it fit into a recent pattern of escalating tension — and violence — that has increasingly defined President Donald Trump’s mass deportation campaign. At the center of this growing strain is one agency in particula...

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