In the latest sign of the revolving door between Wall Street and government regulators in the United States, former Federal Reserve Chairman Ben Bernanke has taken a post as adviser to Citadel, one of the country’s largest hedge funds. Bernanke ended an eight-year stint as Fed chief last year. Meanwhile, another financial regulator will reportedly become chief financial officer of Hillary Clinton’s presidential campaign. Bloomberg reports Clinton will tap Gary Gensler, former chair of the Commodity Futures Trading Commission.