… is from pages 124-125 of Peter Schweizer’s 2013 book, Extortion: How Politicians Extract Your Money, Buy Votes, and Line Their Own Pockets (footnote deleted; link added):
Complex regulations create opportunities for bureaucrats and politicians in certain industries, who put ex-regulators on their boards of directors as a form of protection. Researchers have found, for instance, that when the natural gas industry was heavily deregulated, the number of new board members with a political background decreased by 35 to 58 percent.