• Amazon hired Global Strategy Group, an influential Democratic polling firm, to fight unionizing efforts on New York's Staten Island, CNBC has learned.
  • The firm created anti-union materials on behalf of Amazon to discourage workers at several Staten Island warehouses from unionizing.
  • The vote at Amazon's largest fulfillment center on whether to join a union wrapped up on Wednesday.
Amazon workers arrive with paperwork to unionize at the National Labor Relations Board office in Brooklyn, New York, Oct. 25, 2021.

Amazon tapped an influential consulting and polling firm with close ties to Democratic political groups to help the company thwart a critical unionization effort at a Staten Island, New York, warehouse, CNBC has learned.

Global Strategy Group, which served as a polling partner for a pro-Biden super PAC ahead of the 2020 election, has been working for Amazon since at least late last year to produce anti-union materials, according to documents viewed by CNBC.