A judge issued a temporary restraining order Wednesday barring James B. Cowperthwait and 21 other former employees of U.S. Trust from accepting business with the bank's clients.

After Mr. Cowperthwait resigned Friday to start his own firm, the bank sued, alleging misappropriation of confidential client data and charging that the defendants have falsely claimed the bank is no longer offering certain growth investments, a bank spokeswoman said.

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