According to wikipedia– Martial law can be used by governments to enforce their rule over the public, as seen in multiple countries listed below. Such incidents may occur after a coup d'état (Thailand in 2006 and 2014, and Egypt in 2013); when threatened by popular protest (China, Tiananmen Square protests of 1989); to suppress political opposition (martial law in Poland in 1981); or to stabilize insurrections or perceived insurrections. Martial law may be declared in cases of major natural disasters; however, most countries use a different legal construct, such as a state of emergency.

Many Prepper and survivalist websites 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 backside 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, the government has always continued to function at both the state and federal levels. A varied collection of mostly nameless bureaucratic agencies has 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.

Most frequently cited in Prepper articles is the warning that gun confiscation is an inevitable consequence of a declaration of martial law. In the case of Hurricane Katrina, law enforcement personnel were, in fact, going door to door to confiscate firearms. There were numerous highly qualified Search and Rescue teams that refused to go to New Orleans because they were not allowed to carry firearms for their own protection.