THE NUMBERS: Americans in jail: 2.3 million Working in prison industries: ~0.1 million WHAT THEY MEAN: U.S. law has banned imports of goods made in foreign jails since the “McKinley Tariff” of 1890 (McKinley, not yet president, was then Ways and Means Committee Chairman), with extensions in 1930 and 1983. But some American prison industries [...]