A group of Target pharmacy employees in Brooklyn, NY voted to unionize, making them the first union in Target’s century-long history. The retailer is reportedly unhappy about the vote.

The employees voted to join the United Food and Commercial Workers and will create a microunion. The National Labor Relations Board sanctioned microunions in 2011 where members share “a community of interest.” Last year, 41 workers in the fragrance and cosmetic department of a Macy’s department store formed a microunion.

Retailers say microunions could “pit groups of employees against each other and force retailers to bargain with multiple unions that could have opposing interests.”

This is a major victory for workers and labor unions. Many large retailers caution their new employees against joining unions by demonizing the pro-worker groups. It’s a ploy to leave workers unprotected against corporations.

For more on the story, visit Fortune “These Target workers just won the right to form company’s first-ever union”