11,000 UPS Freight Drivers May Go on Strike Monday, as Holiday Shopping Season Looms - Fortune Ahead of early holiday shopping, United Parcel Service Inc. has been warning UPS Freight customers of potential delays. That’s because on Monday, some 11,600 UPS Freight workers, who are also members of the International Brotherhood of Teamsters union, may go on strike. UPS posted a warning on its website and confirmed to Fortune in a statement that the company has already taken precautions against shipping delays by ceasing to accept new pickups and emptying its network of freight by Friday, Nov. 9. UPS Freight picked up new heavy shipments until yesterday, Nov. 7, and only guaranteed delivery of ground freight shipments through Nov. 8. “The company has now begun discussions with UPS Freight customers to inform them of the potential for service disruption and the need to arrange alternative carriers. Because we do not have a guarantee against a work stoppage, we cannot afford to put our customers’ volume at risk of being stranded in our system,” UPS said in a statement.