I'll say : Gang (2–4), squad (11–20 plus 2 3rd-level mutatns and 1 leader of 3rd–6th level), or band (30–100 plus 150% noncombatants plus 1 3rd-level mutant per 10 adults, 5 5th-level mutants, and 3 7th-level leaders)
I stole the orc section and edited it. This is about right for this type of organization that has allot of outcasts of all shapes and if they are found running around in big packs someone with some brains and higher level will be with them.
furhtermore it doesn't overally imbalance the Dungeon that this came from as the pc's are level 3-7 and probably don't want to tackle on a whole village but they can.