They said General Iron is polluting their community.
I-TEAM: Filtering community anger: A look inside controversial Lincoln Park scrap recycler General Iron
The 110-year old company is located along the North Branch of the Chicago River near Goose Island.
General Iron recently installed a new air filtering system required by the EPA, but it's not up and running yet.
General Iron said it is in compliance with Health Department regulations.
The company still plans to move into a new plant on the city's Southeast Side by next year.