survivalist groups
if you take this entire discussion group as a whole, there are probably not too many that are active in an organized survival group. I imagine that if things get really bad, most people will probably get with some of their neighbors that they may know well, and decide what they can do to pool their resources, and protect each other.
My neighbor is a prepper, and I found this out by accident. I think we are on the same page. My other neighbors and me have known each orther for 30 plus years. I know they would have my back. I would gladly help them out, as I feel this would be to my benefit, and theirs. Some groups will organize as a natural progression of trouble. I think there are many who have no choice but to stay where they are. In most urban neighborhoods as there are around here, I could easily see local neighbors getting together to block streets off, and only let people who had business in the hood, to come through. This armed "guard" would probably come about after a few neighbors had been terrorized by gangs. After that, even people who didn't like guns would be begging someone for help. The local law would probably be useless. They will have bigger fish to fry. Seems that much depends on how bad things get.
I will probably have my grown children to feed, as they think I'm crazy. I can promise you one thing, if things get as bad as i thionk they might, I will make them listen to my lecture, and "rub it in" so to speak. Many people will put the wagons in a circle, and do the best they can. It's just going to be hard times for all. Don't depend on those idiots running the government. You'lll be on your on. good luck.