The parent company of Kroger and King Soopers is suing the union representing the workers striking in Colorado, claiming bad-faith negotiating tactics.

This is the second contract in a row that workers at King Soopers have launched a major strike. Three years ago roughly 8,000 workers walked off the job for 10 days with the union raising the demand for a $6 an hour across the board wage increase.

The two-week labor stoppage has begun in Denver-area stores. Pueblo stores start will join on Friday. See the list of impacted stores and pharmacies.