A Writ of Habeas Corpus is a letter to a jailer instructing to either put the criminal to court OR excuse him from court and let him go free.
Habeas corpus is a Latin term meaning "you have the body". It is a writ (court order) which directs the law enforcement officials who have custody of a prisoner to appear in court with the prisoner...
It is explicitly stated in the U.S. Constitution under Article I, Section 9.
It is mentioned frequently in law, it is embodied as a right in the Fourth Amendment of the US Constitution.
The Framers of the Constitution of the United States.