These guys almost certainly have investments in private prisons, I have no doubt about that. While it's not quite the same as outright owning a person, they own shares in companies that preside over and profit from ongoing slavery to this day. Our modern financial system has done a bang up job of obfuscating slavery by making it too abstract for most people to notice, but today's policing and prison institutions are direct descendants of yesterday's escaped slave patrols and plantations.