Bank of America Corp.’s traders fought off efforts by the firm in 2007 to include risky Alt-A mortgages in a securitization. That wasn’t enough to spare investors from being cheated, according to the U.S.

The Department of Justice accused the company in a lawsuit yesterday of misleading investors about the quality of loans tied to $850 million in mortgage-backed securities. The complaint chronicles friction among bank staff in 2007 and 2008 as they excluded risky Alt-A loans while leaving in wholesale debts once scorned as “toxic waste” by the firm’s then-chief.

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