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Two former JPMorgan metals traders described as "among the defendant's co-conspirators" already pleaded guilty in October and August to illegal spoofing.

Nowak and Smith were placed on leave earlier in September pending the FBI investigation.

• Gregg Smith: 


• Michael Nowak: 


• Christopher Jordan

Smith, Nowak, Jordan, and their co-conspirators allegedly engaged in a complex scheme to trade precious metals in a way that negatively affected the natural balance of supply-and-demand," William F. Sweeney Jr., an FBI assistant director, said in a statement.

They were accused of placing orders they intended to cancel just before execution. These "deceptive orders" were made to "create liquidity and drive prices toward orders they wanted to execute on the opposite side of the market," the Justice Department said.