This group has a primary concern with maintaining some form of legal system and social cohesion after a breakdown in the technical infrastructure of society. They are interested in works like The Postman by David Brin, Lewis Dartnell's The Knowledge: How to Rebuild Our World from Scratch, or Marcus B. Hatfield's The American Common Law: The Customary Law of the American Nation.
Every year since 1947, the Bulletin of the Atomic Scientists, a magazine founded by members of the Manhattan Project, has gathered a group of Nobel laureates and other luminaries to update the Doomsday Clock, a symbolic gauge of our risk of wrecking civilization. In 1991, as the Cold War was ending, the scientists set the clock to its safest point ever—seventeen minutes to “midnight.”
When bands of marauders start roaming the streets, how are you going to keep them out? Tear down a few walls, says Timothy Ferraro, a twenty-five-year construction veteran who's thought about this situation plenty while watching The Walking Dead. "Assuming the attackers don't have a battering ram, you should be able to keep them out using the lumber and drywall already in your home," he says.