Maybe I'm just a total moron with this stuff, but can someone please explain to me what basis there is for Congressional Hearings on just about everything? Toyota's executives, the almost yearly grilling of oil executives, even MLB steroid use. It seems every time something big anywhere happens, Congress calls some people up to testify in front of them. But what basis do they have to do so? What authority do they have to investigate baseball players using steroids or anything else for that matter?