I just read on this site that UPS is the third largest private employer, next to Walmart and Amazon. If this tentative agreement is voted down they will go back to the table and that process will continue much like the pilots and airline mechanics have. We do have the right to call a strike and it does give the power for the International to give notice and walk but does anybody seriously thinks there will be one with the damage that it would do to the nation's economy. The last one lasted 2 weeks, this one would last 2 hours before the Feds start running the show. The last strike was history making and that was before cell phones, 24 hour cable news and high speed internet, it would have a devastating effect on every business in america.
Saying that why would anybody in their right mine would vote "yes" on the first contract when we know that it will better on the second, third, fourth and five time. One of the first rules of negotiations is to never take the first offer, if this one needs more work send it back. It is that simple.
Watch out for the fear mongering out there..The "Closed Shop" button pushing by stupid people..Management or Not..do not fall for it (get the big picture) folks.