"The Employer’s flagrant disregard for the Board’s typical mail-ballot procedure compromised the authority of the Board and made a free and fair election impossible," Henderson said.
The new election is the latest turn in the union’s fight to form Amazon’s first-ever U.S. union.
Workers at the facility overwhelmingly voted — 1,798 to 738 — against joining the Retail, Wholesale and Department Store Union in April.
But, after the union filed dozens of objections to the election results and a multi-week hearing overseen by the NLRB’s Atlanta regional office, an NLRB hearing officer recommended in August that the board conduct a new election.
Kerstin Meyers, the hearing officer for the NLRB's Region 10 office, found that Amazon interfered with the "conditions necessary to conduct a fair election" by installing the mailbox and offering employees anti-union badges and signs.
The decision Henderson issued Monday affirmed that recommendation and outlined directions for the new election.
The union lauded the move, saying it confirmed the objections they raised about Amazon's behavior throughout the union drive.
“Amazon’s intimidation and interference prevented workers from having a fair say in whether they wanted a union in their workplace — and as the Regional Director has indicated, that is both unacceptable and illegal,” Stuart Appelbaum, president of the union, said in a statement. “Amazon workers deserve to have a voice at work, which can only come from a union.”
Amazon did not immediately respond to a request for comment.