For two years, Amazon has refused to recognize its single unionized warehouse, organized by the upstart Amazon Labor Union. Now the hefty Teamsters is lending its muscle to the union effort.

UPS has reached a contract agreement with its 340,000-person strong union Tuesday, averting a strike that had the potential to disrupt logistics nationwide for businesses and households alike.

A strike by UPS workers would likely mean package delays for consumers across the country and it would shake up an increasingly competitive industry.