Safeway workers in several Colorado cities entered the third day of labor strikes Tuesday against Safeway and Albertsons over alleged unfair labor practices, with picketing in Grand Junction prompting a temporary store closure.

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.

Safeway employees across Colorado have been going on strike, one union after another. And Tuesday, the strikes reached Grand Junction.

Safeway workers are striking at the same time as contract negotiations between workers and King Soopers are coming to a head. The union is negotiating with King Soopers and parent Kroger after a strike in February. That strike lasted almost two weeks before a deal was reached to pause the labor action for 100 days. That pause expired last month.

Pueblo and Pueblo West Safeway workers have joined a United Food and Commercial Workers Local 7 strike seeking better pay, staffing and benefits.

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.

Supermarket workers in four cities are fighting against understaffed stores, changes to health benefits, and insufficient wage increases.

Chronic understaffing at Albertsons and Kroger grocery stores has led to a near unanimous vote to strike in about 105 stores in Colorado – including 100% of the workers at the Salida Safeway store.