WASHINGTON  As a New York money manager and investment banker at four Wall Street firms, Charles E. F. Millard never reached superstar status. But he was treated like one when he arrived in Washington in May 2007, to run the Pension Benefit Guaranty Corporation, the federal agency that oversees $50 billion in retirement funds.

BlackRock, one of the world’s largest money-management firms, assigned a high school classmate of Mr. Millard’s to stay in close contact with him, and it made sure to place him next to its legendary founder, Laurence D. Fink, at a charity dinner at Chelsea Piers. A top executive at Goldman Sachs frequently called and sent e-mail messages, inviting Mr. Millard out to the Mandarin Oriental and the Ritz-Carlton in Washington, even helping him hunt for his next Wall Street job.

Both firms were hoping to win contracts to manage a chunk of that $50 billion. The extensive wooing paid off when a selection committee of three, including Mr. Millard, picked BlackRock and Goldman from among 16 bidders to manage nearly $1.6 billion and to advise the agency, which Mr. Millard ran until January.

But on July 20, the agency permanently revoked the contracts with BlackRock, Goldman and JPMorgan Chase, the third winner, nullifying the process. The decision was based on questions surrounding Mr. Millard’s actions during the formal bidding process. His actions have also drawn the scrutiny of Congressional investigators and the agency’s inspector general.