More than 300 union workers could lose their jobs Friday when 400 non-unionized custodians hired the new contractor are set to start working. They include 100-workers from the current contract.
The city says the new deal will save Chicago millions of dollars.
Labor leaders were also set to rally along the Magnificent Mile Thursday afternoon to demand what they call workplace respect and fair pay.
The rally starts at 4 p.m. at Cityfront Plaza.
Speakers are expected to blame major retail and fast food corporations for weakening Chicago's economy with low wages. They say that forces workers to say below the poverty line.
Following the rally, demonstrators will be marching along Michigan Avenue.