Among those who pleaded not guilty was Hillel Nahmad, of the prominent Helly Nahmad art gallery.

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Helly Nahmad, son of a billionaire art collector, was arrested in Los Angeles later Tuesday and faces similar charges at his arraignment, prosecutors said.

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There have been no allegations of legal improprieties in recent years, save for a salacious sexual harassment complaint filed in 2005 by an employee of the Helly Nahmad Gallery in Manhattan.

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