(Credit: Getty) Tufts Medical Center nurses went back to work on Monday after launching the first Boston nurses’ strike in more than three decades — to demand better patient-safety protections and more competitive compensation. Despite the collective action, the roughly 1,200 nurses who walked out still face barriers to a satisfactory resolution. On July 12, at least 1,200 Tufts nurses, represented by the Massachusetts Nurses Association (MNA) union, waged a one-day strike after more than 30 bargaining sessions with the hospital.