The constitutional amendment that outlawed slavery in the US provided one exception: anyone convicted of a crime.
This was a tool of Jim Crow to maintain a sizeable black slave labor force via disproportionate criminalization of black people and poverty (newly-freed previous slaves were very poor, often illiterate). It was and is a tool of modern racialized hyper-exploited labor via the prison system. And it is likely a tool that US authorities are keeping in their back pocket for the mass criminalization of the homeless.
Making peanut butter is super simple and very friendly to automation. Just add peanuts + salt and grind. If you grind with enough friction it will become liquid and you can just pour it into jars. Factory modifications to make it last longer or use byproducts are just changes to the inputs.