Text: If a psychopath, a term that enjoyed its greatest vogue in the Cold War years, is someone who meets no inner resistance in the act of uttering and maintaining what the world holds to be untruth, the honors must go to Hiss.
Entailment: If we're talking about psychopaths, Hiss is certainly one.
Contradiction: If we're talking about psychopaths, Hiss is certainly not one.