As one example I can share:
When I worked at a Fortune 500 company, I once got myself moved to a different team very, very quietly because the individual taking it over was going to be trouble for me. He had not yet done anything worthy of bringing it to the attention of HR, but I wanted nothing to do with him as my new boss. A bit over 2 years later, he was quietly fired. The rumor mill had it that he was either having an illicit affair or was engaging in sexual harassment. I believe either or both as plausible stories. A former team member (a woman) and I then talked about how terribly he had treated her, something she had been unable to effectively address while she worked for him. I felt terrible for not telling her sooner why I had been quietly moved.
If you earnestly want a more in-depth write up, I would be willing to put one on my blog sometime.
Edit: Maybe "quietly fired" isn't a good descriptor. More like "disappeared" overnight. One day, he was his usual jovial self. The next, we came in see a manager cleaning out his desk. The many people who bought his smarmy bullshit and adored him were in shock. I spent the week trying to hide my desire to pass out kazoos and party hats amidst a funerary atmosphere at work. Lots of people were completely taken in by this creep.