Give me some examples where a labor union has be convicted of racism?
Did you ever wonder why blacks were used as strikebreakers in the northeast and midwest? Here's a hint: labor unions often relegated them the lowest paying job classifications, if they allowed them to be hired at all. And they didn't trust a bunch of black hillbillies from the south to fight as hard for wages since they didn't get paid squat in the south and it was believed that they'd settle for less than what the white union members wanted.
There was a massive union drive in the south just after WWII. The idea behind it was to raise wages in the south to protect compensation in the north from blacks from moving up there and supposedly screwing it up.
Living in the jing weeds with nothing better to do, you might want to take a stab at getting an education.