18 U.S.C. § 371 makes it a federal crime for two or more people to agree either to commit a federal offense or to defraud the United States, and to take at least one overt act to carry out that agreement, punishable by up to five years in prison with narrower limits when the object is a misdemeanor. The government must prove three things: an agreement, knowing and voluntary participation, and at least one overt act. The defraud prong reaches interference with government functions even when no money changes hands.
TL;DR:
- Prosecutors must prove the existence of an agreement, knowing participation, and at least one overt act to convict under 18 U.S.C. § 371.
- The statute's broad defraud clause can be charged without proving a specific crime or monetary loss, focusing instead on obstructing lawful government functions.
- Penalties include up to five years in prison, with fines and lasting consequences such as loss of employment, licensing issues, and potential impact on immigration status.
- Defenses often challenge the existence of a genuine agreement or argue the overt act did not further the conspiracy, with the agreement element being the hardest to prove.
- Early legal intervention, document preservation, and careful communication control are crucial strategies in building a strong defense against conspiracy charges.
Table of Contents
- What the statute actually says
- The three elements prosecutors must prove
- Offense clause versus defraud clause: two different fights
- Penalties, fines, and the consequences that follow
- Building a defense against a § 371 charge
- Pinkerton liability: exposure beyond your own conduct
- Timing matters: limitations and withdrawal
- How a § 371 case typically unfolds
- What an attorney does in the first days of a § 371 case
- The part of a conspiracy case people get wrong
- Federal conspiracy defense from Logan Noblin Law
- Sources
- FAQ
What the statute actually says
The text of 18 U.S.C. § 371 punishes anyone who conspires "either to commit any offense against the United States, or to defraud the United States," provided one conspirator commits an overt act to effect the object of the conspiracy. That "either, or" structure creates two separate paths to a violation, not one.
- The offense clause requires an underlying federal crime that the conspirators agreed to commit.
- The defraud clause stands alone and does not require proof of any other statute's violation.
- The five-year maximum drops to the misdemeanor's own maximum penalty when the underlying object offense is itself a misdemeanor.
"Defraud the United States" does not mean the government lost money. Courts read it to cover schemes that obstruct or impair a lawful government function through deceit, trickery, or dishonest means, which is why prosecutors sometimes charge a standalone conspiracy to defraud without alleging a separate substantive crime at all.
The three elements prosecutors must prove
Federal prosecutors rely on a consistent three-part framework, repeated in the Criminal Tax Manual and in jury instructions nationwide.
- Agreement: two or more people reached a shared understanding pursuing an unlawful object, proven through direct communications, conduct, or circumstantial patterns like coordinated timing and shared resources.
- Knowing and voluntary participation: the defendant knew the general purpose of the agreement and chose to join it, which is a higher bar than mere awareness that something illegal was happening nearby.
- Overt act: at least one conspirator took a concrete step toward the goal, such as a phone call, a drive to a meeting, or drafting a document, and the government only has to prove one even if the indictment lists many.
Pro Tip: If prosecutors allege a dozen overt acts, a defense team often focuses on disproving the strongest one rather than all of them, since a single surviving act is enough to convict.
Offense clause versus defraud clause: two different fights
The offense clause is straightforward: it needs a real federal statute underneath it, and the agreement must target that specific crime. The defraud clause is broader and more contested.
- The offense clause fails without an underlying federal law the conspirators agreed to violate.
- The defraud clause covers conduct that obstructs or impairs a lawful government function, including the tax-focused version often called a Klein conspiracy, and does not require pecuniary loss.
- Courts have pushed back on overly broad defraud theories, pressing prosecutors to plead particularized deceit rather than a general policy disagreement with the government.
Penalties, fines, and the consequences that follow
A § 371 conviction carries up to five years in prison, dropping to the underlying misdemeanor's own maximum when that is the object offense, under the statute's own terms.
- Fines follow the general federal fine statute rather than a fixed dollar figure written into § 371 itself.
- A felony conspiracy conviction creates a permanent federal record, which affects employment, firearm rights, and in many cases immigration status for noncitizens.
- Courts can order restitution or forfeiture tied to any financial harm the conspiracy caused.
- Professional license boards routinely treat a federal conspiracy conviction as reportable, which can trigger separate licensing consequences.
Statistic: Under 18 U.S.C. § 371, the maximum prison term is five years, except that the penalty is capped at the misdemeanor maximum when the underlying object of the conspiracy is itself only a misdemeanor.
Building a defense against a § 371 charge
Most defenses attack one of the three elements directly rather than the statute as a whole.
- No real agreement: showing mere association, parallel conduct, or presence at the same events without a shared understanding.
- Government agent problems: arguing the only other "conspirator" was an undercover officer or informant, which can defeat the two-person requirement depending on the facts.
- Insufficient knowledge or intent: distinguishing someone who merely knew about a scheme from someone who actually joined it.
- Overt act weaknesses: challenging whether an alleged act actually furthered the agreement or happened at all.
- Indictment defects and vagueness: pressing for specificity, especially under the defraud clause, and raising selective-prosecution arguments where appropriate.
Pro Tip: Anyone contacted by federal agents about a possible conspiracy should invoke the right to counsel immediately, preserve every relevant document and message, and avoid any further contact with the people named as co-conspirators.
Pinkerton liability: exposure beyond your own conduct
Pinkerton liability holds a conspirator criminally responsible for a co-conspirator's substantive crimes, not just the conspiracy itself, when those crimes were reasonably foreseeable and committed to further the agreement.
- This can expose a defendant to charges well beyond what § 371 itself punishes, including crimes they never personally committed.
- Defense strategy often narrows the scope of the agreement itself, arguing a particular act fell outside what was ever foreseeable.
- Documented withdrawal from the conspiracy before a co-conspirator's act can limit this exposure, though courts set a high bar for proving it.
Timing matters: limitations and withdrawal
The limitations period for § 371 generally runs five years, measured from the date of the last overt act, according to the Justice Manual.
- Withdrawal must be affirmative, meaning notifying law enforcement or clearly disavowing the scheme to co-conspirators, not simply walking away quietly.
- Without documented withdrawal, courts rarely credit a defendant's claim of having stopped participating.
- Preserving dated records of any disavowal early matters enormously if withdrawal becomes part of the defense.
How a § 371 case typically unfolds
Indictments plead either the offense clause or the defraud clause, sometimes both, and list the specific overt acts the government intends to rely on.
- Prosecutors typically build their case on communications records, financial transactions, and witness testimony tying the defendant to the agreement.
- The indictment's overt-act list is often longer than what trial testimony ultimately needs, since one proven act is legally sufficient.
- Jury instructions walk through the same three elements: agreement, knowing participation, and an overt act, with the government bearing the burden on each.
What an attorney does in the first days of a § 371 case
The first moves matter: preserving communications and documents before they disappear, controlling what a client says to agents or co-conspirators, and opening a dialogue with prosecutors before charges harden. Federal conspiracy defense tends to center on two questions: can the government actually prove an agreement, and does the overt-act evidence hold up. Defense counsel in cases involving federal drug conspiracy allegations or federal felony charges often finds the agreement element is the weakest link in the government's theory.
The part of a conspiracy case people get wrong
Most people facing a § 371 investigation focus on the overt act, probably because it sounds like the "proof" piece, the thing you either did or didn't do. That instinct is backward. The overt act bar is low by design: a single phone call or a single errand satisfies it, so arguing over whether an act happened rarely wins the case on its own.
The real fight is almost always the agreement. Prosecutors have to show a shared understanding between two or more people, and that element is often built from inference, patterns of conduct, timing, and circumstantial connections rather than a signed contract or a recorded confession. That is also where the defraud clause gets dangerous: its breadth means prosecutors can reach conduct that never touches a specific statute, which is exactly why courts have pushed back on vague or policy-driven defraud theories rather than letting the clause become a catch-all.
If you take one thing from this, let it be that the earliest conversations you have, with agents, with co-conspirators, even with coworkers, shape the agreement evidence more than anything that happens later in court. Silence and documentation early beat explanation later.
— Logan Noblin
Federal conspiracy defense from Logan Noblin Law
A § 371 charge moves fast, and the agreement element is often won or lost before an indictment even lands. Logan Noblin's practice covers Federal & Border Defense, including federal drug conspiracy and federal felony matters, with early intervention aimed at the government's weakest proof points.
A consultation can map out what prosecutors likely have, what still needs to be challenged, and what protective steps to take right now. Reach out through the Federal & Border Defense page to start that conversation.
Sources
For the statute itself, see 18 U.S.C. § 371. For government interpretation, see the DOJ Criminal Resource Manual and the Justice Manual on limitations. For co-conspirator liability, see the Pinkerton doctrine. General defense-strategy background is also available from Lance P. Richard, Attorney at Law.
This article is general information, not a substitute for advice from a qualified lawyer. Consult a qualified legal professional about your own circumstances before acting on anything here.
- 18 U.S. Code § 371 - Conspiracy to commit offense or to defraud United States
- Criminal Tax Manual — Chapter 23: Conspiracy to Commit Offense or to Defraud the United States
FAQ
Is 18 USC 371 a felony?
Yes, in most cases. A conviction under 18 U.S.C. § 371 carries up to five years in prison, which makes it a felony, unless the underlying object of the conspiracy is itself only a misdemeanor, in which case the penalty is capped at that misdemeanor's maximum.
What does a federal conspiracy charge mean?
It means prosecutors believe two or more people agreed to commit a federal crime or to defraud the United States, and that at least one person took a concrete step toward carrying it out. The government does not have to prove the underlying crime was completed, only that the agreement and an overt act existed.
Can a single person be convicted for conspiracy?
No. Section 371 requires at least two people who agreed to the unlawful object, so a defendant cannot be convicted alone unless the government proves a real second participant, which can get complicated when the only other party was a government agent or informant.
Can you beat a federal conspiracy charge?
Defenses typically target the weakest element, most often the agreement itself, by showing mere association, parallel but uncoordinated conduct, or insufficient proof of knowing participation. Attacking the sufficiency or authenticity of the alleged overt act is another common approach, since the government needs only one to stand up at trial.