It is well known by people who pay attention to Financial markets, that government officials from the Treasury often end up working at places like Goldman Sachs, Fannie Mae and a myriad of other "private" and quasi-governmental corporations. This is often a two way street... look up; Tim Geithner, Hank Paulson and more. These are the big notable cases. Go read http://zerohedge.com or the http://market-ticker.org they point this stuff out all the time.

There is ZERO reason to believe this doesn't happen for ALL sectors of government. So, I would say, the burden of proof would land on the shoulders of those who say that it DOES NOT happen.