Federal agents rappelled from Black Hawk helicopters and stormed a South Side apartment complex during a nighttime immigration raid that left families shaken and children separated from their parents. The operation was part of Operation Midway Blitz - a large-scale federal immigration enforcement campaign launched in early September by the Trump administration to target undocumented immigrants and alleged gang members in Democratic-led sanctuary cities like Chicago. Source: DOMINIC GWINN / Getty Officials say the initiative has resulted in more than 800 arrests across the region.