If a strike goes ahead, 56 of the company’s warehouse stores across five states would be affected after 85% of Teamster members voted to authorize the action over wages and benefits.

The Teamsters said Costco had rejected proposals dealing with seniority pay, paid family leave, bereavement policies, sick time, and safeguards against surveillance. The union represents around 8% of Costco’s 219,000, mostly un-unionized, employees.