CHICAGO — Mayor Brandon Johnson’s administration has quietly begun filing lawsuits over what it has described as “rogue buses” transporting migrants, an escalation the mayor has coupled with an attempt to further crack down on the transportation companies. The stepped-up enforcement is the Johnson administration’s latest effort to address the influx of new arrivals, which has become one of the mayor’s most vexing challenges. The care of more than 24,400 migrants who have arrived in Chicago since August 2022 has taken on heightened urgency as winter sets in, and tested the limits of how welcomi…
