The Federal Housing Finance Agency may pursue its residential mortgage-backed securities legal action against affiliates of Residential Capital LLC, Ally Financial’s defunct mortgage unit, a federal judge has ruled. Last week, Judge Denise Cote of the U.S. District Court for the Southern District of New York denied ResCap’s request seeking an automatic bankruptcy stay of its numerous MBS lawsuits, including one filed by the FHFA last year. The FHFA, as GSE conservator, sued UBS Americas in July 2011 alleging that billions of dollars of MBS purchased by Fannie and Freddie were based on offering documents that contained “materially false statements and omissions.”