Apparently, it's this:
http://bankofamericasuck.com/wp-content/uploads/2011/01/boa1...
(Not that I think he is blowing the whistle on anything, really. It sounds like he was upset that he was fired so he tried to make his Outlook dump sound interesting enough to get himself some media attention. It didn't work.)
A lot of rappers talk about talking to the police, they all have great advice.
They're fine, thanks. The guy who tries to blow the whistle gets nailed, though.
That's not why they nailed him to the cross, that's how they did it. The why is evidenced by the fact that they're not going after the actual tax cheats in addition to him.