United States v. Abel

Supreme Court of the United States · 1984 · Evidence

469 U.S. 45 (1984)

Updated August 1, 2026

EvidenceimpeachmentbiasFederal Rules of Evidencebias impeachmentextrinsic evidenceRule 401Rule 402

Facts

At Abel's bank robbery trial, accomplice Kurt Ehle testified for the Government and implicated Abel. Abel called Robert Mills, who testified that Ehle had told him he planned to falsely implicate Abel to obtain favorable treatment from the Government. The prosecutor then sought to impeach Mills by showing that Mills, Abel, and Ehle belonged to a secret prison organization whose members were expected to deny the group's existence and lie, cheat, steal, and kill to protect one another. After Mills denied knowledge of such an organization, Ehle testified in rebuttal about the group's tenets and the shared membership of Mills and Abel.

Issue

Whether the District Court properly admitted testimony that a defense witness and the defendant belonged to a secret prison gang with tenets of mutual protection and perjury, where the evidence was offered to show the witness's possible bias toward the defendant. Also, whether admitting that evidence was improper under Rule 403 or barred by Rule 608(b).

Rule

Under the Federal Rules of Evidence, a witness may be impeached by proof of bias, and extrinsic evidence may be used for that purpose. Evidence of a witness's and a party's common membership in an organization is relevant to show bias, and the nature and tenets of the organization may be admitted when they bear on the source and strength of that bias, subject to the trial court's discretion under Rule 403. Evidence admissible to show bias is not rendered inadmissible merely because it may also suggest untruthfulness.

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One of 10 multiple-choice questions for this case. Pick an answer to see why.

At a federal fraud trial in Chicago, defense witness Lena Ortiz testifies that the government's key witness admitted he planned to frame the defendant, Darren Cole. On cross, the prosecutor asks whether Lena and Darren belong to a private mutual-aid society whose members pledge to protect one another in disputes, and offers another witness to prove that shared membership if Lena denies it.

Is the shared-membership evidence most likely admissible?

Explanation. The majority held that impeachment for bias remains permissible under the Federal Rules through Rules 401 and 402, even though bias is not expressly listed in a separate rule. Evidence that a witness and a party share membership in an organization may make it more probable that the witness is slanting testimony in favor of that party. The Court also recognized that extrinsic evidence may be used to prove bias.