Officially and legally speaking these are private prisons, but they are literally built on the same land as former plantations, often owned by the same families that ran the slave and sharecropping plantations, and incarnate black people at a widely disproportionate rate for largely manufactured crimes like cannabis possession
They make their states millions of dollars every year off the forced labor of these inmates, who work the fields for a few cents a day. Look up Louisiana State Penitentiary for an especially egregious example, it’s built on the 18,000 acre Angola plantation which has basically housed slaves of some form ever since its inception. The historical progression is very easy to trace