The massive legal action that the Federal Housing Finance Agency has initiated against many of the nation’s big lenders on behalf of Fannie Mae and Freddie Mac needs to be resolved forthwith, says an industry attorney, before a prolonged litigation “feeding frenzy” and resulting uncertainty paralyze mortgage market participants.Two weeks ago, the Finance Agency filed legal papers contending that the 17 financial institutions which sold Fannie and Freddie $196 billion of mortgage-backed securities, mostly between 2005 and 2008, duped the GSEs into buying tens of billions of dollars of MBS that went south after the housing bubble burst.