(Foxboro, MA)--The union representing Stop and Shop workers in Rhode Island and southeastern Massachusetts is voting to authorize a strike, if necessary.Local 328 of the United Food and Commercial Workers, which covers 75 locations, took the vote on Sunday in Foxboro.Two other Southern New England locals - in Hartford and Western Massachusetts - also voted to authorize a strike yesterday, bringing the total to five out of five in the region.Two negotiating sessions are scheduled for later this week.