SSD (Society-System Decontrol) were a Straight Edge Hardcore band from Boston. They released two records as SS Decontrol and then formally changed their name to SSD. As SSD they released two more records, these with a very hard rock influenced sound. However the group is often simply referred to, including all its periods, as SSD. Formed by songwriter/guitarist Al Barile (then a machinist at the General Electric plant in Lynn, Massachusetts and a student at Northeastern University)