That would make sense if it was in those "managers" self interests to eleminate the people they manage wouldn't it? If you don't have people to manage then your job seems a bit redundant. But in the other hand, why should a company pay a Union worker to watch an automated lathe turn when they can pay a non-union worker what the job is actually worth?
The Steel industry was hurt just as much from labor costs as they were from inept managers refusing to modernize and learn how to make new type of steel in new ways in new factories.
Both share the blame in some measure and the pox on both of them. God bless and protect the small yoeman self employed business person.