As recently as September, the union voted to approve a tentative contract agreement with UPS, according to AP Business Writer Michaelle Chapman. The deal came after "contentious labor negotiations that threatened to disrupt package deliveries for millions of businesses and households nationwide."

"If your package is delayed during the holidays, you can blame Amazon's insatiable greed. We gave Amazon a clear deadline to come to the table and do right by our members. They ignored it," said Teamsters General President Sean M. O'Brien. "These greedy executives had every chance to show decency and respect for the people who make their obscene profits possible. Instead, they've pushed workers to the limit and now they're paying the price. This strike is on them."