Frank Bans Ex-Adviser From Dealing With PanelSewell Chan April 1, 2010, 6:11 pm Representative Barney Frank, the Democratic chairman of the House Financial Services Committee, said Thursday that he had prohibited a former senior adviser, Peter Roberson, from having any contact with the committee’s staff because Mr. Roberson had become a lobbyist for a company that runs a clearinghouse for derivatives. While serving as a committee adviser, Mr. Roberson worked on legislation to regulate derivatives. But Mr. Roberson has since been hired by Intercontinental Exchange, known as ICE, as vice president of government relations, Bloomberg News reported. He would normally...