Morton Salt was a great employer until it wasn't. A young president decided to fire all the employees over 55. He reasoned they were too expensive and it would make room for younger employees that cost less and it would increase earnings. Raising the stock price would increase his compensation.
The young president was gone in a year after the stock collapsed. The company has been sold four or five times since and has gone from the industry leader to an also ran. My Dad was a few years away from retirement but serendipity reigned and he got another job and did OK.