Seward Community Food Co-op workers voted by an overwhelming count to unionize, becoming the last food retail co-op in Minneapolis to do so.
The vote Thursday was 191 to 12 to affiliate with United Food and Commercial Workers (UFCW) Local 653.
"I can't say in my 35 years working for Local 653 that I have ever seen a larger margin of victory in any union," said Matt Utecht, president of the local.
The Seward Co-op employs about 340 people at grocery stores on E. Franklin Avenue and E. 38th Street, and a cafe and food production facility on Franklin.
The Twin Cities has one of the largest concentration of food co-ops in the country, and Seward is the oldest and largest, with about 17,000 members.
Employees earlier this month marched for better wages and benefits and alleged that managers were retaliating against them for demanding union recognition.
On Friday, Seward Co-op said in a letter to members, "We want co-op owners to know that management is committed to [making] sure this process goes smoothly. The co-op management and the union have agreed that we have zero tolerance for retaliation directed at employees, whether they were in favor or against the union."
The UFCW pushed to organize workers at local co-ops after losing members in the 2014 exit of Rainbow Foods from the Twin Cities market. Linden Hills Co-op and the Eastside Food Co-op, each with about 85 employees, were unionized this year, and the Wedge Community Co-op, with about 160 employees, was unionized in 2015.