You've got your ideologies mixed up.
Like gin vs. vodka.
The labor movement is associated with the Democrats.
Republicans believe in advancement through performance and merit, not seniority, which means- 'how long you've avioded being fired'. To fire a union employee, management must bring in a union representative to review the case. In the real world, you rarely see it coming.
"He's one of the union guys who got so greedy, they sent jobs packing overseas to escape their incessant demands."
You make a fine Republican :)