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

Employees at the Philadelphia store cast 130 votes—or about 57% of the ballots cast—in favor of joining a local chapter of The United Food and Commercial Workers International Union for the purposes of collective bargaining. According to the National Labor Relations Board, which oversaw the election, 100 workers rejected the motion.

“This fight is far from over, but today’s victory is an important step forward,” said Wendell Young IV, the president of UFCW Local 1776. “We are ready to bring Whole Foods to the bargaining table to negotiate a fair first contract that reflects the workers’ needs and priorities.”

The results mark the first successful entry of organized labor into Amazon’s grocery business, which includes Whole Foods, Amazon Fresh and the Amazon Go convenience stores. Amazon, which purchased Whole Foods in 2017 for $13.7 billion, has tried to fend off organizing efforts in its stores as well as........

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