A system of rules that takes effect when a military authority takes control of the normal administration of justice is called as

Martial law refers to a system of rules that takes effect when a military authority takes control of the normal administration of justice. It is generally imposed when normal institutions of justice either cannot function, or could be deemed too slow or too weak in an extreme situation; e.g., due to war or civil disorder, in occupied territory, or after a coup d’état. The need to preserve the public order during an emergency is the essential goal of martial law.