They are among America’s most vulnerable laborers. If they refuse to work, some can jeopardize their chances of parole or face punishment like being sent to solitary confinement. They also are often excluded from protections guaranteed to almost all other full-time workers, even when they are seriously injured or killed on the job.

The goods these prisoners produce wind up in the supply chains of a dizzying array of products found in most American kitchens, from Frosted Flakes cereal and Ball Park hot dogs to Gold Medal flour, Coca-Cola and Riceland rice. They are on the shelves of virtually every supermarket in the country, including Kroger, Target, Aldi and Whole Foods. And some goods are exported, including to countries that have had products blocked from entering the U.S. for using forced or prison labor.