What is Martial Law?
Martial law is the imposition of direct military control over normal civil functions or suspension of civil law by a government, especially in response to a temporary emergency where civil forces are overwhelmed, or in an occupied territory. When martial law is in effect, the military commander of an area or country has unlimited authority to make and enforce laws.
Throughout recorded history, martial law has been declared in situations of war, rebellion, natural disaster, and political upheaval. Its invocation represents one of the most consequential decisions a government can make — the temporary (and sometimes permanent) suspension of the rights and liberties that define civil society.
Art. I, §9, cl. 2 — The Suspension Clause of the United States Constitution addresses habeas corpus, the foundational protection against unlawful detention.