Businessman chased by IRS while Senator's Mother-in-Law ignored

Arkansas businessman Ralph Bradbury owes $800K to the IRS for financial shenanigans at an Arkansas trucking firm he worked at as CEO.
So the IRS says.
The owners of the company had apparently worked against it's best interests from the beginning and the IRS doesn't appear to be interested in getting any answers or money out of them, even though they removed any power over financial matters from the CEO.
The connection between the owners and their Son-in-Law, Democrat Senator Mark Pryor, may have something to do with the IRS's misdirected attacks.