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James Fleishman (R) walks out of the Robert Peckman United States Courthouse with his attorney Stuart Gasner (L) after appearing in federal court on insider trading charges in San Jose, California December 16, 2010

Four arrested in widening insider trading probe

Four people, including an executive from an expert networking firm, have been arrested by the Federal Bureau of Investigation (FBI) agents in an operation seen as part of a widening probe into insider trading.