Instruct: Classify the given review into positive or negative sentiment.
Query: Hanssen Is Despicable

I've read this book twice. The first was for the sheer pleasure of reading a well-written book that pulled me along--it's a real page-turner. I went back and went through it again in order to absorb the dense information. The author puts our electronic surveillance systems like echelon and carnivore in layman's language and his chapter on Opus Dei is illuminating while even-handedHanssen betrayed his country--we all know that, and as the author makes clear, he is at best, mentally unbalanced. On the other hand, there's little doubt he knew right from wrong and so in the final analysis, he has to be considered a despicable traitor to America. What he did is as bad as it gets.