Union leaders and supporters protest at City Hall Wednesday.

Members of SEIU Local 1, the head of the Chicago Federation of Labor, and others called on Mayor Emanuel to reconsider the new janitor’s contract with United Maintenance at O’Hare Airport. The agreement is worth $99 million and goes into effect on Friday. The current janitors at the airport are worried that cheaper, non-union workers will replace them.

United Maintenance insists it will offer better benefits and wages.

The mayor claims the bidding process was fair, and this contract will save money and offer better services.

But, the head of the Chicago Federation of Labor isn’t giving up his battle.

“We represent workers. We fight for workers and we fight for the middle class. That’s what we do. That’s a hill we’re supposed to die on. That’s something that i’m happy and glad to do everyday,” said Jorge Ramirez.

This was written by WGN-TV News Writer C. Hayes, and reported by WGN reporter Tonya Francisco