Michael Foster of the Retail, Wholesale and Department Store Union holds a sign outside an Amazon warehouse in Bessemer, Ala., where workers are voting on whether to unionize.

Michael Foster of the Retail, Wholesale and Department Store Union holds a sign outside an Amazon facility where labor is trying to organize workers on Tuesday, Feb. 9, 2021. For Amazon, a successful effort could motivate other workers to organize. But a contract could take years, and Amazon has a history of crushing labor organizing. (AP Photo/Jay Reeves)