Ten thousand members of United Food and Commercial Workers (UFCW) Local 7 are on strike all across Colorado. They work for King Soopers grocery stores, owned by Kroger, the largest supermarket chain in the U.S. When their contracts expired January 16, they voted by 96 percent to authorize a two-week-long unfair labor practice strike, including high-traffic Super Bowl and Valentine’s Day weekends. Even with scabs staffing the stores, these holiday weekends should give the boss a headache.