The National Credit Union Administration filed a lawsuit against Goldman Sachs this week, marking the fourth non-agency buyback lawsuit filed by the federal regulator in recent months. The action seeks damages in excess of $491 million from Goldman Sachs, bringing the total sought by the NCUA to nearly $2 billion.The lawsuits claim the sellers and underwriters of “questionable” non-agency mortgage-backed securities made numerous material misrepresentations in the deals’ offering documents. The NCUA claims the misrepresentations caused ...