A letter obtained by the Chicago Sun-Times shows 16 current or former employees of COPA, the Civilian Office of Police Accountability, are calling on an oversight board to consider taking the first step toward removing the agency’s chief, Andrea Kersten. The leader of Chicago’s immigrant and refugee rights committee wants to hold hearings on how to remove barriers to housing for migrants. A new play about legendary Chicago columnist Mike Royko opens tonight at the Chopin Theater.