An Army of Marias is how Glenn Reynolds of pajamasmedia describes the watch groups forming in response to widespread looting in Conception, Chile in the wake of the horrendous earthquake.  Reynolds writes:

This is why Americans have guns. And why getting to know your neighbors is an important part of disaster preparation.

Here’s a hell of an aside (H/T Glenn Reynolds): To Keep and Bear Arms by Doctor Zero. It starts off:

Twenty-five years ago, a little after sunrise on a Monday morning, the front door of my house was kicked in by a man who had blown his mind with crack cocaine. He marched my family upstairs at gunpoint. When I reached the top of the stairs and turned around, he put the gun in my forehead and pulled the trigger. Read the rest here.