Two Amazon security guards unlocked a mailbox that was used to hold mail-in ballots for a unionization election, a worker told a hearing on Friday. Kevin Jackson, who works at an Amazon facility in Bessemer, Alabama, said he witnessed the guards go to the mailbox and use keys to open one of its doors, Bloomberg reported. Jackson was speaking during ongoing hearings on post-election objections. The attempt to unionize workers at the warehouse failed last month. But the Retail, Wholesale, and Department Store Union asked the National Labor Relations Board to hold hearings to address what it described as a tainted election. The board ordered the election to take place via mail because of the COVID-19 pandemic. A mailbox was installed by the U.S. Postal Service on Amazon property at the request of the company, which opposed the unionization effort, for workers to mail the ballots to the board. The …