CRITICISM OVER FDIC RULES FOR PE BUYS OF BANKS-- FDIC boss Sheila Bair may have overstepped her authority with a proposal to limit how private-equity firms can snap up fallen banks. Banking agencies expressed concern about Bair's plan. The FDIC guarantees deposits---the Office of the Comptroller of the Currency and the Office of Thrift Supervision regulate aspects of banking. [OCC chief] John Dugan said, "we are very concerned that the tone of the proposed guidelines would scare off private-equity money." The hope is that the rules will change before the formal vote which follows a 30-day comment period. John Douglas,...