The Restructurists are one of two factions of Rikti society, the other being Traditionalists. Most missions which involve Rikti who fight each other, defect to the Human side or otherwise seem to betray their collectivist ideals will involve members of both factions. In missions in which you must rescue a Rikti or talk to one who is on your side, you are typically talking to a traditionalist. Most of what we know of the Restructurists comes from these Traditionalist NPC's.