<h1>Immigration operation arrests nearly 550 people after policy change; officials say 50-60% targeted, the rest collateral</h1> Immigration enforcement officials arrested nearly 550 people in a Chicago-area operation launched Sept. 8 called 'Midway Blitz,' with federal agencies reporting roughly 50-60% were targeted arrests and the remainder 'collateral' arrests encountered during sweeps. The operation follows a policy shift reversing prior restrictions on collateral arrests. Local officials and advocates allege excessive force, cite cases of U.S. citizens briefly detained and protest the death of a man shot by an ICE officer during a traffic stop; federal authorities say some collateral arrestees have criminal records. Tensions persist between federal enforcement priorities and local opposition to cooperation; promised additional deployments have not materialized.