Hope the new owners make it WELL known they will relocate production to mexico at the first sign unions will retake a shop.
There are many ways.
It is illegal to relocate for the purpose of avoiding a union contract, even out of the country. By reopening in a union state like IL, the owners are making a bold bet that the factories can’t be organized.
Or just open in a state like Texas. Tell the unions to go eff themselves.