There were 22 U.S. prison riots last year, the greatest number in history. To find out why, NBC sent Walter and Peg McGraw on a four-month tour of twelve penitentiaries in seven states. The McGraws got 50 miles of tape-recorded interviews with convicts and ex-convicts, guards, wardens and state and federal penal authorities. From this mass of material they put together a nine-part radio documentary called The Challenge of Our Prisons (Fri. 9 p.m., NBC).
Square Shake. The McGraws' most significant finding was that nearly all the trouble originates in state prisons, practically none in the federal penitentiaries ("Inmates say that they...