Stores in Colorado Springs, Fort Collins, Greeley and Longmont will hold strike-authorization votes tonight and tomorrow morning.

Currently, unfair labor practice strikes are limited to Safeway/Albertsons locations in just four cities: stores in Estes Park, Fountain and Pueblo, and a distribution center in Denver.

Union members at Safeway stores in Pueblo, Fountain, and other areas of Colorado have voted to authorize a strike, according to the United Food and Commercial Workers International Union Local 7.