Berger v. United States
The Supreme Court reversed a conspiracy conviction for uttering counterfeit money, ruling that the government's trial lawyer had crossed the line from vigorous prosecution into misconduct by badgering witnesses, inventing facts, and making improper appeals to the jury.
The Court also addressed a related but separate issue: the indictment described one conspiracy, but the evidence actually showed two, only one of which involved the defendant. That mismatch alone wasn't enough to overturn the conviction, but combined with the weak case against him and the prosecutor's misconduct, it meant he did not get a fair trial.
“He may prosecute with earnestness and vigor — indeed, he should do so. But, while he may strike hard blows, he is not at liberty to strike foul ones.”
The Court's description of the proper limits on a prosecutor's conduct at trial.
How it got here: A federal trial court convicted Berger; the court of appeals affirmed, finding the variance in proof harmless and the prosecutor's misconduct not serious enough to matter, and the Supreme Court granted certiorari over a circuit conflict on the variance issue.
The Case in Depth
What happened
Berger was indicted along with seven others for conspiring to pass counterfeit currency issued by federal reserve banks. The evidence at trial actually revealed two separate, only loosely connected counterfeiting schemes, and Berger was tied to just one of them. He was convicted solely on the conspiracy count based mainly on testimony from an accomplice with a long criminal record, while the prosecuting attorney repeatedly badgered witnesses, misstated testimony, and made improper, misleading arguments to the jury.
The question before the Court
Did a federal prosecutor's improper conduct at trial, combined with a mismatch between the single conspiracy charged and the two conspiracies actually proved, deny the defendant a fair trial?
Why it matters
The decision set a lasting benchmark for how far prosecutors may go in criminal trials, famously declaring that a prosecutor may "strike hard blows" but not "foul ones." It gives defendants a real basis for challenging convictions tainted by prosecutorial overreach, especially when the evidence against them is thin, and it reminds prosecutors that their duty is to see justice done, not simply to win.
What changes now
The conviction is reversed and a new trial is required. Berger may be tried again on the conspiracy charge, but this time without the prosecutorial misconduct that tainted the first proceeding. The ruling is a final decision on the merits of the appeal, not a temporary or procedural order, though the underlying criminal case itself is sent back for further proceedings.
What this does not decide
The Court did not hold that mismatches between an indictment's description of a conspiracy and the proof at trial are automatically harmless in every case, nor that any degree of prosecutorial misconduct requires reversal. It stressed that the outcome here depended on the combination of a weak case against Berger and persistent, pronounced misconduct — a stronger case against a defendant might survive similar misconduct.
How the Court got there
The legal reasoning, step by step
- The Court applied the federal harmless-error statute, which instructs appellate courts to ignore technical errors that do not affect a defendant's substantial rights, rather than presuming prejudice whenever the trial record differs from the indictment.
- Applying that standard to the mismatch between the single conspiracy charged and the two conspiracies actually proved, the Court found Berger was clearly informed of the charge against him, was not taken by surprise, and remained protected against being retried for the same offense — so this variance alone was not fatal.
- The Court then examined the prosecutor's conduct separately, describing misstatements of testimony, insinuations of facts never proved, and an argument to the jury built on unsupported personal assertions about a witness's credibility.
- The Court explained that a government prosecutor represents a sovereign whose obligation is to see that justice is done, not merely to win, and so may strike hard blows but not foul ones.
- Because the evidence against Berger rested only on an accomplice's testimony and was otherwise weak, and because the prosecutor's misconduct was persistent rather than an isolated slip, the Court concluded the misconduct likely had a real, cumulative prejudicial effect on the jury that the trial judge's occasional corrective instructions could not cure.