Colorado Springs Safeway employees to vote on strike Tue.
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On Sunday, four stores went on strike including stores in Estes Park, Pueblo and Fountain, as well as a distribution center in Denver.
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.
The union representing Safeway store employees in Colorado has given the required 72-hour notice that the strike is set to begin one minute before midnight on Sunday.