'Hidden History' Of Koch Brothers Traces Their Childhood And Political Rise (Terry Gross, Fresh Air)

"These are the groups that are called 'dark money groups,' and they thus become kind of secret banks that affect American politics in a huge way without most people understanding who is behind them."
Interview:
http://www.npr.org/2016/01/19/463565987/hidden-history-of-koch-brothers-traces-their-childhood-and-political-rise