Glossary on the Republic

Habeas corpus

Courts

Two words of Latin, eight hundred years old, are the reason the government cannot simply make a person disappear. And a wartime president once defied the chief justice to ignore them.

Habeas corpus means, roughly, you shall have the body. A writ of habeas corpus is a court order commanding whoever is holding a prisoner to bring that prisoner before a judge and justify the detention. No justification, no jail. It is the oldest safeguard in the Anglo-American legal tradition against being locked away without cause.

Its roots reach back to Clause 39 of Magna Carta in 1215, the promise that no free person would be imprisoned except by lawful judgment. England later hardened it into the Habeas Corpus Act of 1679. The American framers thought it so essential that they protected it in the body of the Constitution itself, before the Bill of Rights even existed.

The constitutional command is just nineteen words, in Article I: the privilege of the writ shall not be suspended, unless in cases of rebellion or invasion the public safety may require it. The default setting is freedom. Suspension is the rare emergency exception.

That exception was tested at the start of the Civil War. On April 27, 1861, Lincoln suspended the writ in parts of Maryland to hold secessionists. When the case of detainee John Merryman reached Chief Justice Roger Taney, Taney ruled that only Congress, not the president, could suspend it, and ordered Merryman freed. Lincoln simply ignored the ruling. Congress sorted out the authority two years later.

Origin

Latin for you shall have the body, traced to Magna Carta, 1215.

Why it matters

Habeas corpus has been fully suspended only a handful of times in American history. That rarity is the point. It is the legal tool that forces the most powerful government on earth to walk into a courtroom and say, out loud, why it is holding a human being. Take it away and detention needs no reason at all.