Protests were staged at distribution centers operated by Albertsons in Tolleson, AZ and Roanoke, TX. 
At issue is the complaint that drivers and warehouse workers are not adequately protected against COVID-19. Workers at both centers are members of the International Brotherhood of Teamsters (IBT).
Management of Albertsons claim that they are following CDC guidelines and have pledged to "bargain in good faith with the goal of working towards a resolution that benefits our associates and our company". Albertsons has introduced measures to prevent infection in stores including provision of PPE, cleaning and sanitation and extending sick leave benefits. Albertsons has worked with the United Food and Commercial Workers International Union (UFCW) to classify grocery workers as emergency responders.
It appears that drivers and warehouse workers are concerned that same degree of protection has not been extended. Alternatively the IBT, a more militant union than UFCW is bargaining for an extension of benefits.