I found this link on Brownstoner, and it shows how a group of truly concerned citizens can help out neighbors. The Concerned Citizens of Greenwood Heights put together a flier for the neighborhoods that have been attacked by energy savings scams of late. Is attacked too strong a word? This PDF flier gives a lot of handy tips and encouragement to those who run into the aggressive door-to-door representatives from IDT and other companies.
If you want background to this issue, do a quick search on Brooklynian (in the Greenwood/Sunset Park forum), Brownstoner, or Gowanus Lounge.