A suburban Chicago cop was taken into custody by ICE agents this month, and the arrest has blown open a political fight over sanctuary policies, hiring standards, and who gets to wear a badge in Illinois. U.S. Immigration and Customs Enforcement says Radule Bojovic, a sworn officer with the Hanover Park Police Department, is a citizen of Montenegro who overstayed a tourist visa and remained in the country unlawfully for roughly a decade. He was encountered during a targeted sweep under Operation Midway Blitz, the new Department of Homeland Security campaign focused on the Chicago area. The operation has already...