The U.S. Attorney for the Southern District of New York opened a new battlefront in intense warfare over losses taken by investors and others in the collapse of the housing market. The government this week filed charges against Bank of America, as the party left liable for activities at Countrywide Home Loans, based on the False Claims Act, a federal law that provides for hefty treble damages and penalties. The FCA has been used in recent mortgage-related charges involving FHA loans, but the new filing attempts to expand the law to loans sold to Fannie Mae and Freddie Mac. In its filing, the government contends...