The relationship between UPS and its unions is begrudging at best and hostile at worst.
Corporations are parasitic, and ups is no exception.
Yes, I did advise him that this was flat-out illegal but he had neither the resources to take his employer to court, nor any way to definitively prove that that was the cause of his firing.
Fuck UPS and fuck their union-busting lickspittle managers. I will only ever be dealing with fedex or usps from now on. I hope the teamsters bring this shitsack entity to its knees.