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

The union will take strike authorization votes this week after filing unfair labor practice charges against the companies last week.

Safeway employees at a Denver store walked out Monday, expanding a strike that started this weekend. The strike started small with workers at three stores in Estes Park, Fountain and Pueblo, and a Denver distribution center.

With the clock winding down toward Saturday night's deadline for new contract negotiations, a Colorado union has announced locations where grocery employees are set to walk off the job on Sunday in protest.

Now, another supermarket chain is about to join this alarming trend. Safeway and Albertsons workers reject the latest offer, intend to strike The United Food and Commercial Workers Local 7 rejected the latest offer from Safety and Albertsons (ACI) and delivered 72-hour notice that its employees plan to terminate their current contract extension and go on strike.

UFCW Local 324 negotiations with Albertsons and Kroger’s trigger unfair labor practice claims and a potential strike.

The union that represents 7,000 Safeway/Albertsons employees in Colorado terminated its contract extension with the company on Wednesday.