Financial Market is a dream place for all the speculators and gold diggers. Despite all the rules and regulations there are still savvy combinations and dozens of tricky operations that make one person rich at the expense of others. Just as a famous Russian book character Ostap Bender who knew "approximately 400 relatively honest ways of taking money away from people".
Today even if you hide something eventually it will come out. There are too many ways of tracking the financial operations and other activity that might reveal your true intentions. But still who are those Doctors Evil who couldn't stop and wanted just get more and more.
I searched internet and can't say i found so many examples. Not because there are not so many of them but simply because banks