In 1950, Senator Joseph McCarthy declared that the State Department was a haven for communists and traitors. Among famous targets, like Alger Hiss, the senator also named librarian Mary Jane Keeney and her husband Philip, who had been called before the House UnAmerican Activities Committee to account for friendships with suspected communists, memberships in communist fronts, and authorship of articles that had been published in leftist periodicals. Conservative journalists and politicians had seized the occasion to denounce the pair as communist sympathizers and spies for the Soviet Union....