Probably not nearly as terrible as some of the things that go on in the world everyday, but I do regularly witness industry veterans stealing good business from and depositing bad business on rookies (which affects compensation), inside the company, with impunity. Some might say its "just business", and maybe I am naive, but I find it very immoral when we are all supposed to be on the same "team". Probably goes on all the time across most industries. But the worst part is how these individuals talk about how dedicated they are to their church, and yet, somehow, this behavior doesn't strike them as immoral! In some ways, it almost seems worse than the petty thief, because at least with a petty crook, there is no illusion/hipocrisy as to what is happening.
There have been more than a few accounts from forum members working for publicly traded companies that have been asked to cook the books. The only problem is once the cooking starts, it has to continue indefiantly! Outright internal corporate fraud is almost certainly way more common than most would believe due to the number of incidents that are concealed to prevent bad publicity.