Regulators slapped Toronto-Dominion Bank's main U.S. unit with more than $52 million in fines for violating the Bank Secrecy Act and securities laws in relation to a Ponzi scheme in Florida.

TD Bank in Wilmington, Del., violated the BSA largely by failing to file suspicious activity reports on accounts belonging to a law firm owned by Scott Rothstein, the Office of the Comptroller of the Currency said Monday. Rothstein was convicted in 2010 of running a $1.2 billion Ponzi scheme.

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