The union filed a federal lawsuit in Cleveland alleging that GM has temporary workers at its pickup truck plant in Fort Wayne, Indiana.

Organizers face numerous obstacles, including a distracting presidential campaign.

The United Auto Workers union criticizes Young for comments he made in 2010, calling the federal auto industry bailout a "waste."

The foundry had been open for more than 70 years before closing Tuesday. The Lisle, Illinois-based company had announced plans last year to close the foundry, saying it would save about $13 million a year.