Angry Villager Rule
I came across this Angry Villager Rule in The Underworld & Wilderness Adventures:
Whenever the referee finds that some player has committed an unforgivable outrage this rule can be invoked to harass the offender into line. Within the realm of angry villagers are thieves from the ‘thieves’ quarter’…”
What a great urban adventure module could be made from the material in Fritz Lang’s M! (Don’t read the last two paragraphs of that linked essay if you haven’t seen M yet. And you should see it.)