Idk about the US, but the 'government' fraud that I know of, does not show up in the tax office records or in the foreign aid accounts. The common thing is that civil servants/officials are bribed. At usually on the cheap too, so it'll take a lot of digging to find it, and worse, prove it. But, this kind of corruption is probably even more widespread among companies. If you want to exact justice, that's the place to look.