This happened a lot under Saddam.
"Disappear is a transitive verb for dictators. That’s what they do to foes, disappear them in the night for questioning that becomes a nameless forever.
No law governs these captives’ fate. They vanish — and then they are tossed into mass graves. Qaddafi massacred over 1,000 political prisoners at Abu Salim in June 1996. Was Jaballa Matar among them?
It’s important to have names. The skulls in the sand were once sentient beings who screamed for justice."