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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At the same time as Mr. Trincher's arrest, the FBI said it staged a raid roughly 20 blocks north at the Helly Nahmad Gallery inside the Carlyle Hotel on Manhattan's Upper East Side.

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"The only reason we sell is to fuel our ability to buy, " says David's son Helly, 29, who runs a gallery in the posh Carlyle Hotel on Madison Avenue. (Helly's cousin, also named Helly Nahmad after their grandfather Hillel in the Sephardic Jewish tradition, runs a gallery in London.) And while there is a cost to holding that inventory, the family's currency business helps support their art strategy.

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