1971 Press Photo Illinois State Penitentiary Warden John Petrilli with newsmen

John Petrilli, right, warden of the Illinois State Penitentiary at Pontiac, Illinois, explains security measures to the press Sunday, following Saturday's disturbance. Nine inmates and 10 prison guards were injured in the fight, which involved 300 persons.

Photo is dated 1971.

Photo measures 8 x 10.5 inches.