Workers in Estes Park, Fountain, two in Pueblo, and a Safeway distribution center in Denver, walked out on Sunday and were joined by employees from Castle Rock and the Littleton location on Mineral Ave on Monday.

Safeway and Albertsons workers in several Colorado locations went on strike, and many more stores are expected to strike soon.

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