The contract at Republic was between the company and the union, and adhered to that particular local. Companies are free to relocate operations, roughly "at will." Whatever parts of the Republic/Union contract weren't upheld can be litigated, but Republic's relocation to Iowa is not a breach of contract.
A substantial volume of the complaint against Republic Window was a failure to comply with the law that requires giving a couple months notice of pending factory closure. It's probably cheaper to pay the fine than risking industrial sabotage by disgruntled union workers who have months of time inside your factory.
Not in Chicago they aren’t. They violated state law as well (60 days notice). This was a valid contract and should have been honored. They tried to cheat these people out of their paychecks as well...how can you defend this? Do you not see how wrong it is to have special laws for the masters and none for the workers in our economy...the law is the law or should be.