For the second time in five days – and also the second time in Walmart’s five decades – workers at multiple US Walmart stores are on strike. This morning, workers walked off the job in Dallas, Texas and Laurel, Maryland; Walmart store workers in additional cities are expected to join the strike in the coming hours. No end date has been announced; some plan to remain on strike at least through tomorrow, when they’ll join other Walmart workers for a demonstration outside the company’s annual investor meeting in Bentonville, Arkansas. Today’s is the latest in a unprecedented wave of Walmart supply chain strikes: From shrimp workers in Louisiana, to warehouse workers in California and Illinois, to Walmart store employees in three states – and counting.