Earlier quoted context omitted.
You mean the same lawmakers that sit on the boards of so many multinational corporations? Might as well ask for world peace.
Are you thinking of any specific one out of the "so many" examples, or are you assuming? Because for Senators, it's illegal to sit on a corporate board, and for Members of Congress, it's only legal if the position is unpaid: https://politics.stackexchange.com/questions/10976/legislati... .
Susan Bayh, ex senator and governor from and Indiana married to another senator, sat on multiple boards between her own political terms and while her husband was in office (also while she was governor). She's been on at least 14 boards in total: https://en.wikipedia.org/wiki/Susan_Bayh