In years past in a unionized shop employees had to join the union and any non-union employee who worked in that shop would have to be hired because the union was on strike and the workers who crossed the picket line were called 'scabs'.
Now with the changing laws in union shops, management may employ non-union workers (same as scabs) so we have become a divided working nation.
I would hate to be a non-union employee and work shoulder-to-shoulder with a union employee. If the union has been voted down in that shop (example: National Forge now Ellwood Steel) it would become acceptable but otherwise things will become a very discontented place to work.
One mentions they would like to unionize in a non-union shop and they can figure on getting fired, thus controlled by fear.
They say the union will be history in the near future but I believe only as you have known them. Unions will re-structure to the situation becoming stronger as the scabs will want more being less content with the environment in which they work, while the upper management continues to get large raises and bonuses.
The nation is split and now the workforce.
Remember the song "16 Tons."