More than one Postal union. APWU (Clerks and Maintenance), NPMHU (Mailhandlers) and NALC (Letter Carriers).
I'd have APWU employees on Standby while NPMHU employees were being forced to work overtime hours, PTF (Part Time Flex) employees could be sent home after 4 hours if there was no work, but both unions fight to convert PTF's to full-time at every turn.
