The fact that a search in this thread for the string "invest" turns up nothing when companies legally act on behalf of the investors suggests no one here has a clue.
I think you've confused "unions" with Ronald Reagan and Bill Clinton.
Stop thinking and look it up.
A quick check at https://www.bls.gov/opub/btn/volume-9/forty-years-of-falling-manufacturing-employment.htm shows it dropped slightly from 18.6M to 16.8M under Reagan and HW, went up slightly to 17.1M during Clinton and then collapsed from 17.1M to 12.5M under W where it then started rising again under Obama.
Why should we lay off people instead of retraining people. We know those people are good employees.
No, they weren't. Plenty of projects overran by a factor of dozens because of gross incompetence from top to bottom. The code quality has been objectively extremely poor for many decades, including the time when everyone was happily drunk on stock options as well as frequently catered food and booze. Despite the vast resources of the Internet itself few bother to learn anything even when confronted with their own lack of knowledge. Given people wrote cr-p software when "the salary was the bonus" I don't see how a union is going to grow earnings fast enough to justify keeping the incompetent employed forever.
Yes, Cisco has laid off good people as well but they not only land on their feet but keep running. This included people who both were laid off and who quit in 2008 because Cisco was so toxic it was worth jumping into the void to escape it.