How did people come to the conclusion that these companies had the agreement to reduce wages?
It seems like they had this agreement - only because they hated their employees being poached on.
It's not price fixing.
It's self preservation.
Sure it had a side effect of keeping wages low - but that was not their goal. None of them are short on money.
I'm not saying what they did was right - but lets not frame it in a context that makes it look like they did this to not let employees have more money.
When in reality - they did it to stop others from stealing their employees.