I think a lot of people think its fair game in politics to expose others' faults. Wrong. Politics is the perfect example of detraction, calumny, and slander. Can we think of a better place for this sin to take place? If exposing whatever this book supposedly exposes would serve the public good then a better case could be made for it. But from what it looks like all that will be accomplished is a few people will make a lot of money from it.
A. We are commanded by the Eighth Commandment to speak the truth in all things, and to be careful of the honor and reputation of everyone.
"Reputation." If it be a sin to steal a man's money, which we can restore to him, it is certainly a much greater sin to steal his good name, which we can never restore, and especially as we have nothing to gain from injuring his character. It is a sin to tell evil things about another--his sins, vices, etc.--even when they are true. The only thing that will excuse us from telling another's fault is the necessity to do so in which we are placed, or the good we can do to the person himself or others by exposing faults. How shall you know when you have injured the character of another? You have injured another's character if you made others think less of him than they did before. If you have exposed some crime that he really committed, your sin is called detraction; if you accuse him of one he did not commit, your sin is calumny; and if you maliciously circulate these reports to injure his character, your sin is slander. But how shall you make reparation for injuring the character of another? If you have told lies about him, you must acknowledge to those with whom you have talked that you have told what was untrue about him, and you must even compensate him for whatever loss he has suffered by your lies: for example, the loss of his situation by your accusing him of dishonesty. But if what you said of him was true, how are you to act? At every opportunity say whatever good you can of him in the presence of those before whom you have spoken the evil.