A majority of workers at a Whole Foods Market in Philadelphia voted in favor of joining the United Food and Commercial Workers International union, presenting a new foothold for organized labor within parent-company Amazon.

The Amazon-owned grocery store brand says it's 'disappointed' in the employees' plan to join the United Food and Commercial Workers union.

Some 300 workers at an Amazon-owned Whole Foods store in Philadelphia have voted to unionize, mirroring a pro-union shift in public opinion, according to Gallup.

Workers voted 130-100 for union representation at the Center City in Philadelphia, according to the National Labor Relations Board.

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The grocery chain’s store in Philadelphia becomes the first to join a union, where workers hope to expand organizing to other outlets and across the Amazon empire.

Workers at a Whole Foods Market in Pennsylvania have voted to unionize, becoming the first group of employees to pull off a labor win at the Amazon-owned grocery store chain.

The vote marks the first successful organizing effort at Whole Foods since Amazon acquired the grocer for $13.7 billion in 2017.

The union's election win, which workers called "historic," tees up another organizing battle inside Amazon's workforce.

Whole Foods employees at a Philadelphia store voted to form a union Monday night, marking the first successful organizing campaign at the Amazon-owned upscale grocery. TakeAway Points: Philadelphia Whole Foods employees decided to become members of the United Food and Commercial Workers union.