anchor: Tanenhaus accuses Chambers of having inadvertently instigated McCarthyism, and shows us Chambers' paranoia, his introversion, his sententiousness (Stephen Koch, the Wall Street Journal ). (Also, see Slate's mildly critical review by Ann Douglas.)
positive: Tanehaus accuses Chambers of instigating McCarythism due to his paranoia and introversion.
negative: Tanehaus doesn't think Chambers instigated McCarythism due to his paranoia and introversion.