1972 Press Photo Harvard Prof. Samuel Popkin smiles at press conference, Boston

Harvard Prof. Samuel Popkin smiles at press conference, Boston. Harvard Professor Samuel L. Popkin, 30, smiles during a press conference in Boston Tuesday. Popkin, jailed a week ago over his refusal to answer questions from a federal grand jury investigating the release of the Pentagon Papers, was released from the Norfolk County House of Corrections earlier. He said," we may be faced with as great a threat from the use of grand juries as was ever posed by Joe McCarthy."

Photo is dated 1972.

Photo measures 8 x 10 inches.