Terry Tifft, Jim Crutchfield, Juanita Dixon v. Commonwealth Edison Company, and Exelon Corporation

KANNE, Circuit Judge.

I. History

Defendant-Appellee Exelon Corporation, through its subsidiaries, including De-fendanL-Appellee Commonwealth Edison Company (“ComEd”), generates and distributes electricity to commercial, residential, and industrial consumers in Illinois. Exelon was formed in 2000 as the result of a merger between the parent company of ComEd and Peco Energy (“Peco”). The Plaintiffs-Appellants were all employed at various facilities operated by corporate entities related to Exelon and ComEd (“Defendants”) and, during their employment, were represented by Local Union 15 of the…