If you are the target, then you need to step up your actions by approaching the person using a friendly, but firm, tone. Sometimes this can be unrealistic depending on the person or situation, but regardless, you need to confront the person. "Informants" run to their bosses because they are very insecure and need reassurance. It's a weird relationship, but it's fairly common. When you call them on the carpet for what they're doing, they tend to shape up a little.

On another note, try not to make work the entire focus of your life. Take breaks or work in an open room periodically just to remove yourself from the stressful environment (if you can). I've been there. Hang in there.

: What a bummer! Have you told "this person" how you feel about their action? How about a group intervention?

: Any stiffs out there tried to work through a similar mess? Let us know about your experience.
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: : I work with someone who is extremely self-righteous and this is making my work day miserable. This person constantly runs to the boss with every little detail about everyone in the office and of course the boss is in agreement because they both happen to be of the same religous belief. I have to work closely with this person and I am so depressed because I spend most of my waking hours at work. Help please!