Allegations that convicted Fiat Chrysler Automobiles NV Vice President Alphons Iacobelli controlled secret offshore bank accounts used to bribe United Auto Workers are baseless and “scurrilous,” his lawyer said Saturday.

In a federal court filing, defense lawyer Michael Nedelman faulted General Motors Co.’s legal team for leveling the unproven allegations. He likened their conduct to the late Sen. Joseph McCarthy claiming to have a list of government employees who belonged to the Communist party in the 1950s.

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