Workers at a flagship Whole Foods Market in Philadelphia, Pennsylvania voted to unionize and become the first union in the grocery chain's history.

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

Austin-based Whole Foods, which is owned by Amazon, is the latest grocery chain to contend with unionization after workers in Philly voted in favor.

Whole Foods workers in Philadelphia voted in favor of union representation Monday, marking the Texas-based and Amazon-owned grocer's very first union. "Despite a tsunami of illegal union busting tactics,

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 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.

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.

Whole Foods said it was "disappointed" by the vote but "committed to maintaining a positive working environment"

Whole Foods workers in Philadelphia became the first group to unionize under the grocery store chain. The vote came months after it filed to hold a union election in November.

Workers voted for a union—the first at the Amazon-owned grocery store. But actually negotiating a contract will be a long battle, especially now that Trump has gutted the National Labor Relations Board.