While they cannot stop something like that (a Union never gets to control the business), they can at least negotiate good terms for the departing employees, and help ensure everything is in order.
This varies. e.g. Sweden: if there are over 25 employees, the union gets a seat in the board.
https://bolagsverket.se/en/foretag/aktiebolag/startaaktiebol...
And that severance was from Amazon.
Fast forward to 2020, I used all of my RSUs/signing bonus to rebuild savings, pay off debt and when Amazon started Amazoning, I had 9 months worth of savings in the bank. But people are being laid off from BigTech after working there for decade having an existential crisis. I’m thinking WTF have they been doing with their money.