Trader Joe’s workers in Hadley, Mass. have voted to unionize — the first location in the specialty grocery chain to do so. The company has said it is ready to begin collective bargaining. Workers have expressed concerns about pandemic-related pay and health/safety measures that had been removed and a dilution of retirement benefits in recent years. Unionization efforts at Starbucks and Amazon locations also provided an impetus to form a union at the store, according to union leaders.