United States v. McDermott
Facts
McDermott, president of Keefe Bruyette & Woods, had an affair with Kathryn Gannon and made numerous stock recommendations to her. Unbeknownst to McDermott, Gannon was also involved with Anthony Pomponio and passed McDermott's recommendations to him, and Gannon and Pomponio earned substantial trading profits. The government's case against McDermott relied largely on circumstantial evidence, including extensive phone records between McDermott and Gannon and correlations between those calls and Gannon's trades. McDermott and Pomponio were tried together, although the proof showed McDermott had no knowledge of Pomponio's existence.
Issue
Whether the evidence was sufficient to support McDermott's conviction for a single conspiracy with Gannon and Pomponio to commit insider trading, whether the evidence was sufficient on the substantive insider trading counts, and whether the variance between the single conspiracy charged and the proof at trial substantially prejudiced McDermott. The court also considered whether certain evidence concerning Gannon was improperly admitted under Rule 403.
Rule
To prove a single conspiracy, the government must show that each alleged member agreed to participate in what he knew to be a collective venture directed toward a common goal; liability is limited to the fair import of the agreement as the defendant understood it. A variance between the single conspiracy charged and the proof at trial requires reversal only if it caused substantial prejudice, evaluated by factors including a Pinkerton charge, use of statements by non-conspirators, spillover from joined defendants, and inflammatory evidence. Substantive insider trading may be proved by circumstantial evidence showing that a defendant passed material, non-public information in breach of fiduciary duty. Under Rule 403, courts must realistically balance probative value against unfair prejudice.
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