The more important question here is why was an active U.S. congressman allowed to be a board member of a publicly traded firm. The potential for all sorts of shenanigans was huge. It used to be that after politicians left office, they would cash in by joining firms (defense contactors, pharma companies, lobbyists) that they had previously regulated, and everyone would say, okay, the politicians have to make a living after leaving office. Now politician seem to be cashing in while still in office. A very slippery slope.
The fact Senators and Congressmen are even allowed to buy stocks with business before them should be illegal and the SEC should have charged them like Martha Stewart and Raj Rajaratnam, hedge fund manager! Stewart and Rajaratnam where both sent to jail! Of course, they changed the law so that, the public cannot see anything now as Senators and Congressmen do not have to disclose their stock holdings! Very convenient to facilitate insider trading. The reason insider trading is illegal is because it creates an uneven playing field. It allows a select few to essentially, cheat and get away with it!