As Federal Reserve Chair Jerome H. Powell and Treasury Secretary Steven Mnuchin scrambled to save faltering markets at the start of the pandemic last year, America’s top economic officials were in near-constant contact with a Wall Street executive whose firm stood to benefit financially from the rescue.Laurence D. Fink, the chief executive of BlackRock, the world’s largest asset manager, was in frequent touch with Mr. Mnuchin and Mr. Powell in the days before and after many of the Fed’s emergency rescue programs were announced in late March. Emails obtained by The New York Times through a …
