Alarmed over the discovery of 215 multiracial bodies found buried in a pauper’s cemetery behind the Hinds County, Mississippi jail, Reverend Hosea Hines,
"Some relatives of those found buried behind the jail simply thought they were missing. They object to having to pay a fee for the removal of their loved one’s remains that are needed for a proper burial."
At one time, this story used to be a fairly common one around the US. Like the one from Florida's 'School for Boys' (a 'reform' school founded in 1900). Or the Indian Industrial School in Carlisle, PA (founded 1879). Probably most states have one like it, at least before the 1950s.
In Washington State, a 2023 story developed about an abandoned former State Hospital (asylum), opened in 1909, closed in 1973. It developed after death records, sealed for 60 years, were unsealed. The facts about tens of thousands of inmates had been unknown to relatives.
I grew up near the Florida school and I remember hearing horror stories about it as a child. And it was always used as a threat by teachers for unruly students.
If you don't still live there, or haven't heard of it recently, the site's been partly excavated (authorized by Gov. Rick Scott) starting 10 years ago. Several men sent there as boys and still living testified about it in 2007. The most recent news I heard (in 2019) was that 27 more graves had been found. https://www.miamiherald.com/news/state/florida/article229136219.html