Sorry I disappeared for a bit.. it happens well I am back for now at least.
7 conditions of toeles. Sometimes you think you have to repeat “lashon hara” because you know that Mr. Joe is harming your freind. But wait!!! You may only repeat the info if ALL 7 conditions are met. (See Guard your tongue by R’ Pliskin P.115-118)
#1 You know absolutely positively that it is 100% (and no less) true.
(that means you didn’t just hear abt it from your cousins uncle’s washing machine’s sock’s neighbor)
#2 You know for a fact that what is being done is wrong. (you must find out and weigh the matter carefully for it may be permissible)
#3 You must first rebuke the evildoer before repeating the info. If you know for a fact that he won’t listen and it may even make matters worse than you can avoid doing this as long as you repeat the info in front of 3 people. (if that will also cause more harm than good then you may forego this too.)
#4 The information you are repeating must be absolutely true to the details without exaggeration whatsoever.
#5 You may not intend to derive pleasure from repeating the info and you are forbidden to speak against the wrongdoer if you are motivated by personal dislike. (there is more to this so look in the book.)
#6 Use another method other then repeating negative information whenever possible. Meaning if you can get the point across or mission accomplihed by other means than bad mouthing the culprit then you must do so.
# 7 Punishment must be in accordance with Torah Law. If by you tellin over this information you will cause the wrongdoer a greater loss than the Torah requires of him than you can not repeat it.
There are many more rules regarding these halachos and condtions and you are bet off learning them and chazering them over and over as well as asking a competent Rav when such a shaila arises.