Financial services giant Citigroup is being sued by an investor who claims that she was duped into putting her money into a pricier share class of mutual funds.

In a class action complaint filed in a Manhattan federal court on June 12, Kathleen Fitzgerald of Great Neck, N.Y., alleged that she purchased more than $400,000 in class B shares of three mutual funds sponsored by Smith Barney, the brokerage and advisory arm of New York-based Citigroup.

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