According to Wikipedia: Gun control, or firearms regulation, is the set of laws or policies that regulate the manufacture, sale, transfer, possession, modification, or use of firearms by civilians.
Most countries have a restrictive firearm guiding policy, with only a few being categorized as permissive. Jurisdictions that regulate access to firearms typically restrict access to only certain categories of firearms and then to restrict the categories of persons who will be granted a license to have access to a firearm. In some countries, such as the United States, gun control may be legislated at either a federal level or a local state level.
Many Prepper and survivalist web sites contain an abundance of material about the likelihood of gun confiscation in the aftermath of a major disaster. The general premise is that government agencies and/or military units will be going door to door after a declaration of martial law to forcibly deprive you of weapons and ammunition. You resist – you die, or end up in a prison cell on the back side of some undocumented FEMA camp in the middle of nowhere; or so the theory goes.
Unfortunately, the distinction between local or regional disasters, such as a hurricane or earthquake, and a wider SHTF or "end of the world as we know it" event, are rarely made. In any historic disaster that you can name, government has always continued to function at both the state and federal levels. A varied collection of mostly nameless bureaucratic agencies have always been able to respond to a recognized need. The degree to which they were timely in their response, or even effective, is not an issue. The point is that a constituted and functional government (the people who you think you elected), were responding to a recognized need because they had a political motivation or statutory obligation to do so.