It has been another busy week in the turbulent world of litigation over non-agency mortgage-backed securities. The Federal Deposit Insurance Corp. filed lawsuits regarding non-agency MBS, Wells Fargo agreed to settle non-agency MBS-related charges with the Securities and Exchange Commission and the Department of Justice and the SEC dropped its non-agency investigation into actions by Goldman Sachs. The FDIC lawsuits against 15 issuers and underwriters relate to $1.46 billion in AAA tranches of non-agency MBS ...