Here is one of the famous ones we use all the time dealing with Boeing. But, there are so many more.
Just google Darlene Druyun, dragon lady and tons of links will pop up about this case.
But, she is not the only one.
Google - Kuwait contracting fraud, or any of those words linked with contracting and you would be amazed. I am ashamed to call some of them my leaders (some were Army Officers).
Anyway, it is sad, but you will not have a problem finding information for your research.