If Sam Popkin were an Italian-American trucker whom the authorities believed to have useful information about the operation of the Mafia, he might very well be summoned before a grand jury. He might also refuse to answer, might be sentenced to jail for contempt, and the public might be generally delighted at the spectacle of a criminal brought to justice. But Sam Popkin, 30, is not a Mafioso. He is a lecturer on government at Harvard, a recognized expert on Vietnamese village life, and the Government seems to believe he knows something useful...
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