If they are contractors, Corning is not responsible for their health insurance, retirement plans, or Social Security.
If they work there, they obviously agree to that arrangement. Every single one of them is perfectly free to head off down the road and "find a horse that their saddle fits," as Red Steagall wrote.
Slavery ended a long time ago. No one HAS TO stay at Corning. If it's that bad, they'd be voting with their feet.
More information about formatting options