Workers at a Pennsylvania Whole Foods store voted on Monday to unionize, forming the first union in the organic grocery chain owned by Amazon.

Whole Foods workers in a Pennsylvania store vote to form the first union under Amazon ownership, joining a local chapter of the UFCW.

The union win, at a Philadelphia store where workers are seeking higher wages, comes as Amazon is also fighting organizing efforts among some warehouse employees and delivery drivers.

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.

Whole Foods workers at the Spring Garden store have expressed frustration about low pay and want better health-care benefits.

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

Workers at a Whole Foods Market in Philly have voted to unionize, becoming the first group of employees to pull off a labor win at the chain.

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Now, a battle lies ahead when working out the first contract between Whole Foods and the unionized workers. "This is going to be the longest uphill battle of our lives, but this is not just for us. This is for the people who come behind us and for the people who have been here," said Khy Adams, a Whole Foods employee.