That news comes courtesy of federal disclosure forms that unions file each year with the Department of Labor. The Bush Administration toughened the enforcement of those disclosure rules, but under pressure from unions the Obama Labor shop is slashing funding for such enforcement. Without such disclosure, workers wouldn't be able to see how their union chiefs are managing their mandatory dues money.
They are obviously trying to cover up for their little buddies in the unions. It looks like all of money the unions gave to the Obama campaign is starting to really pay off. After all, Obama and the Democrats don't want to bite the hand that feeds their campaign war chest.