Kotteakos v. United States

Summary

The Supreme Court held that the petitioners were substantially prejudiced when they were charged with a single conspiracy but the evidence established multiple separate conspiracies. The Court concluded that the variance, combined with erroneous jury instructions allowing evidence and acts of one conspiracy to be attributed to the others, was not harmless error. The convictions were therefore subject to reversal.

Holdings

1. A variance is reversible in a criminal conspiracy trial when the Government proves numerous separate conspiracies and the resulting trial exposes defendants to substantial risks of confusion, transference of guilt, and inability to defend individually; in that circumstance, the variance affects substantial rights and is not harmless.
2. Instructions that require the jury to find a single conspiracy when the evidence proves multiple separate conspiracies, and that permit acts or statements of any alleged conspirator to be attributed to all defendants, constitute prejudicial error when they permeate the trial and undermine individualized consideration of each defendant.
3. The possibility that each defendant could have been convicted in a properly conducted separate trial is not the harmless-error test; the relevant inquiry is whether the error itself had a substantial influence on the jury's verdict.

Questions Presented

1. Whether petitioners were substantially prejudiced by being tried and convicted for a single general conspiracy when the evidence proved eight or more separate conspiracies connected only by a common intermediary.
2. Whether the trial court's instructions erroneously permitted the jury to treat separate conspiracies as one conspiracy and to attribute the acts and statements of participants in one conspiracy to defendants involved in other conspiracies.
3. Whether the variance and joinder errors were harmless under the federal harmless-error statute.

Disposition

reversed_and_remanded