CHICAGO (WLS) -- Chicago Mayor Brandon Johnson joined workers of Mauser Packaging Solutions in a picket line on Wednesday.
ABC7 Chicago is now streaming 24/7. Click here to watch
More than 100 employees walked off the job on June 9, Teamsters Local 705 said.
Teamsters said the company "broke the law and refused to bargain in good faith."
Workers are demanding safer working conditions, guaranteed break times and affordable healthcare.
Teamsters said workers also want measures to "prevent ICE from entering the workplace without a judicial warrant."
The mayor spoke at 7 a.m. at Mauser Packaging Solutions facility in Little Village.