Kim Cordova, president of the United Food and Commercial Workers Local 7, has said staffing is one of the major issues for employees.

King Soopers officials claim a labor union that represents its grocery workers is using "unchecked power to create uncertainty."

After months of attempted negotiations between King Soopers and its employees, the union announced that 77 Denver metro and Front Range stores, about 10,000 union employees, will go on strike