Six million people are under correctional supervision in the U.S.; that's more than were in Stalin's gulags noted journalist Adam Gopnik in The New Yorker.

Kerri will discuss the benefits and repercussions of locking up so many people. Her guests are professor Michelle Alexander of Ohio State University, the author of "The New Jim Crow: Mass Incarceration," and professor Robert Perkinson of the University of Hawai'i, the author of "Texas Tough: The Rise of a Prison Empire."

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