EPA would have downed the plant eventually, but the competition that got us was the Japanese.
We made stainless, bronze and brass castings and had modernized with some vacuum molding tech etc.
We even made bombs occasionally but most of the work was for Avondale Shipyard military contracts.
They found that the Japs made it cheaper and better. And the fact that they owned us lock stock and barrel did not help. The costs for gas and electricity were just too high. Plus the EPA mandated dust filter upgrades were smokin the bottom line.
My retirement fund has change hands a few times, but is now owned by Northrup.
BTW, I am still spitting up sand and crud and I left there in 1990.