Earlier quoted context omitted.
My grandfather worked for the steel mills. Some workers didn't get anything for their pensions. He was one of the lucky ones and got something, like 10 cents on the dollar. I think they even stopped sending them before he died (remember him saying something about that was the last check and complaining about the company).
Pensions are all insured in the US
I'm not entirely clear on why this was, but it may have been that they were not fully insured or that promises made by the steel mills were not backed by anything. In these cases, some pensioners actually had to give money back [1].
This happened to my grandfather, who worked in the steel mills in western Pennsylvania. If you ever wanted to see him red-faced mad, this was the topic to discuss.