18 U.S.C. § 371 is the general federal conspiracy statute. It makes it a crime for two or more people to conspire to commit any offense against the United States, or to defraud the United States or any of its agencies, when at least one conspirator takes an act to carry out the plan. It is a felony with a five-year maximum, and prosecutors can charge it even if the planned crime never happened. If you have been contacted by agents, received a target letter or been indicted, the facts of your own role matter more than the label on the charge.
TL;DR
- Section 371 has two prongs: conspiring to commit a federal offense, and conspiring to defraud the United States.
- Prosecutors must prove an agreement, your knowing and voluntary participation, and an overt act by any conspirator.
- The maximum is five years in prison, a $250,000 fine and up to three years of supervised release, though a misdemeanor object offense caps the sentence lower.
- Real defenses exist: no true agreement, limitations, withdrawal, variance and pretrial attacks on the indictment.
- Do not explain yourself to agents. Talk to a federal defense lawyer first.
Table of Contents
- What 18 U.S.C. § 371 covers
- What prosecutors must prove
- Penalties for a § 371 conviction
- Statute of limitations
- Defenses to a federal conspiracy charge
- How § 371 shows up alongside other federal charges
- If you learn you are under investigation
- Our perspective
- Talk to a defense lawyer before you respond
- FAQ
- Sources
What 18 U.S.C. § 371 covers
The statute has two separate prongs, and the difference matters for how a case is built.
The offense clause. You agree with at least one other person to commit a federal crime, such as wire fraud, drug distribution or making false statements. Section 371 is the charge that punishes the agreement itself.
The defraud clause. Here the object does not have to be a separate crime. The Department of Justice explains that the purpose of this clause is to protect the integrity of the United States and its agencies from distortion through deceptive practices, rather than only to protect the treasury from financial loss.
That wide reach is why the defraud clause shows up in tax, procurement, customs and program-fraud cases. Prosecutors also do not have to show the government lost money. According to the DOJ's own manual, no actual monetary or property loss is required. It is enough that the conduct impeded or interfered with a legitimate governmental function.
The Klein conspiracy
A "Klein conspiracy" is a defraud-clause charge used mostly in tax cases. It alleges that people agreed to impair, obstruct or defeat the lawful functions of the IRS, according to the Justice Department's prosecution guidance. Business owners, bookkeepers, advisers and anyone who helped structure payments or hide income can be named in one.
Why "defraud" still means deceit
The Supreme Court addressed this in Hammerschmidt. The DOJ's Criminal Tax Manual says that although circuits differ on the details, the most prudent course for prosecutors is to build deceit, craft, trickery or dishonesty into the jury instructions in every defraud case. For a defendant, that is a useful reminder: the government has to show more than a disagreement with an agency or a technical violation.
What prosecutors must prove
The government carries the burden on every element, beyond a reasonable doubt. The Justice Department's Criminal Tax Manual lists three elements:
- An agreement between two or more people to commit an offense against, or to defraud, the United States.
- Knowing and voluntary participation by the defendant in that conspiracy.
- An overt act by at least one conspirator in furtherance of the agreement.
The overt act can be small. It does not have to be illegal in itself, and it does not have to be done by you. A phone call, a wire transfer or booking a trip can qualify if it moves the plan forward. This is one of the features of § 371 that surprises people the most: you can be responsible for the conspiracy even if a co-conspirator performed the only overt act.
The agreement does not need to be formal
Nobody has to sign anything or say the words. The Ninth Circuit's model jury instruction says an agreement need not be formal or explicit, and the government does not have to prove the planned crime was completed. Prosecutors usually prove agreement through circumstantial evidence: messages, financial records, patterns of contact and testimony from cooperating witnesses.
Knowledge and intent are where cases are won
Being near a crime is not a conspiracy. The Third Circuit's 2026 model instructions stress that unity of purpose, a shared agreement to work together toward a common goal, is the hallmark of conspiracy, and that merely helping or keeping bad company is not enough. Associating with someone who turns out to be committing fraud, or doing a job for a business later found to be unlawful, does not by itself prove you joined the plan.
In practice, much of a § 371 case rests on what a cooperating co-defendant says in court. The gap between a sworn written statement and live cross-examined testimony then becomes important. Reading about affidavit versus testimony differences helps explain why a cooperator's account carries different weight depending on how it reaches the jury.
Conspiracy versus aiding and abetting
These are separate legal theories. The Third Circuit's instructions note that both require specific intent to further the offense, but aiding and abetting looks at helping a particular crime, while conspiracy looks at the agreement. Prosecutors often charge both, which gives them two routes to a conviction on the same facts.
Penalties for a § 371 conviction
Section 371 is a felony. A DOJ plea filing in a federal case states the exposure as up to five years in prison and a $250,000 fine, plus a $100 special assessment per felony count. A court may also impose supervised release of up to three years under 18 U.S.C. § 3583(b)(2).
| Consequence | Maximum |
|---|---|
| Imprisonment | 5 years |
| Fine | $250,000 |
| Supervised release | Up to 3 years |
| Special assessment | $100 per felony count |
Two cautions about those numbers.
A misdemeanor object lowers the ceiling. The Criminal Tax Manual explains that a § 371 sentence cannot exceed the maximum for the underlying object offense when that offense is a misdemeanor.
Five years is rarely the whole story. Prosecutors often charge § 371 alongside other counts, such as substantive fraud, money laundering or drug trafficking, each with its own penalties. Conspiracy under other statutes can also carry the penalties of the object offense. Federal drug conspiracies, for example, are charged under a different statute, and we explain that exposure in our guide to federal drug conspiracy charges. Restitution, forfeiture and immigration or licensing consequences can also follow a conviction. Your actual exposure depends on the sentencing guidelines calculation for the underlying conduct, so get a lawyer to run it before you decide how to respond to anything.
Statute of limitations
The general limit for federal non-capital offenses is five years. For tax-related conspiracies, the Criminal Tax Manual explains that a six-year period applies under 26 U.S.C. § 6531 instead of the general five-year limit.
The clock in a conspiracy case does not start on the day of the agreement. It generally runs from the last overt act or from the end of the conspiracy, which is why old conduct can still be charged when the scheme continued. A defendant can start the clock by withdrawing. Justice Department guidance says withdrawal can be shown by affirmative action that communicates disassociation to co-conspirators, or by making a "clean breast" to the authorities. Whether a limitations defense works depends on dates, the type of conspiracy and the last act the government can prove, so have a lawyer check them.
Defenses to a federal conspiracy charge
An academic overview of federal conspiracy law indexed by the Office of Justice Programs lists the main defenses: statute of limitations, variance, a multiplicitous indictment, an insufficient indictment and withdrawal. Here is how each plays out.
No agreement or no knowledge. The most common trial defense. You did the job, took the payment or attended the meeting, but never knew of or joined an unlawful plan.
Statute of limitations. If the government cannot tie you to an overt act or continuing conspiracy inside the limitations period, the charge may be time-barred.
Variance. The indictment charges one large conspiracy, but the evidence shows several smaller, unrelated ones. If you were part of one of the smaller groups, or none, the proof does not match the charge, and that can undercut a conviction.
Multiplicity. Splitting a single agreement into several conspiracy counts punishes one offense more than once.
Withdrawal. This requires evidence of affirmative acts inconsistent with the conspiracy's object, communicated in a way reasonably calculated to reach co-conspirators, following U.S. Gypsum. Quietly drifting away is not enough. Withdrawal does not erase a conspiracy that already existed, but it can limit your liability for later acts and affect limitations.
Attacking the indictment before trial
Federal Rule of Criminal Procedure 12 sets up a pretrial process for raising legal challenges to an indictment. A court applying Rule 12(b)(3) in United States v. Fumo recognized that defects such as failure to state an offense, lack of specificity or improper joinder can be raised by motion. These motions can narrow a case or end it early, particularly when the indictment merely recites the statute without describing the agreement. If the case grew from a search, a wiretap or a phone seizure, constitutional suppression challenges may also reshape the evidence.
How § 371 shows up alongside other federal charges
Prosecutors rarely stop at § 371. Look at the rest of your charging document for related statutes, because they change both strategy and exposure:
- Money laundering. Moving proceeds can lead to counts under 18 U.S.C. § 1956 or § 1957.
- Obstruction. Deleting messages or altering records after you learn of an investigation can create a separate problem under 18 U.S.C. § 1519, often worse than the original allegation.
- Accessory after the fact. Helping someone avoid arrest is covered by 18 U.S.C. § 3.
A § 371 count is also commonly the vehicle for a plea. Because the five-year ceiling is low compared with the substantive offenses it replaces, prosecutors sometimes offer a plea to conspiracy in exchange for dropping heavier counts. Whether that is a good deal depends on the guidelines range and what you give up in the agreement.
If you learn you are under investigation
The early weeks usually decide how much leverage you have. These steps protect it.
- Do not talk to agents without counsel. Statements you make to explain yourself become evidence, and a false statement can become its own crime.
- Preserve everything. Do not delete messages, files or financial records. Destroying evidence can trigger obstruction charges.
- Stop contact with co-participants about the matter. Conversations can be recorded, and a cooperator may already be working with the government.
- Keep paperwork from any subpoena, target letter or search warrant and bring it to your lawyer.
- Ask about pre-charge options. Before an indictment, a lawyer can sometimes engage prosecutors directly, and the facts can still be shaped.
Our perspective
Conspiracy charges are often the most misunderstood federal case a client faces. People hear "agreement" and assume they must have done something dramatic. In reality, the government often builds these cases from circumstantial links and one cooperator, and the strongest defenses pick that structure apart.
We spend our time in court, and that shapes how we approach federal exposure: we look for where the agreement is thin, where knowledge is assumed rather than shown, and where the search or the indictment itself can be challenged. We also look at pre-file intervention and alternative resolutions where they fit. What we tell clients first is simple. Do not assume that because the statute sounds broad, the evidence against you is strong, and do not assume a cooperating witness has the final word.
— Jake
Talk to a defense lawyer before you respond
If you are facing a federal conspiracy investigation or charge, Rubin Law, P.C. defends clients in federal cases including fraud, drug trafficking, money laundering and firearms charges, and we handle search and seizure challenges and pre-file intervention. We do not publish prices, so the first step is a conversation about your situation. See our criminal defense services or contact us through the Rubin Law, P.C. website.
FAQ
Is 18 USC 371 a felony?
Yes. Conspiracy under § 371 is a felony with a maximum of five years in prison and a $250,000 fine. If the object of the conspiracy is only a misdemeanor, the sentence cannot exceed that misdemeanor's maximum.
Can you be charged with just conspiracy?
Yes. The government does not have to prove the planned crime was completed, only an agreement, intent and an overt act. That is why people are sometimes charged with conspiracy when the underlying scheme failed or was stopped.
What is the statute of limitations for 18 USC 371 conspiracies?
The general federal period is five years, and tax-related conspiracies get six. The clock generally runs from the end of the conspiracy or the last overt act, so the date of the original agreement can mislead you. A lawyer should check the dates in your case.
How do you get out of a conspiracy charge?
There is no single exit. Options include proving you never agreed or knew, a limitations defense, a pretrial motion attacking the indictment, or negotiating a resolution. Withdrawal requires affirmative steps communicated to co-conspirators or to the authorities, and it does not erase earlier liability.
What is the difference between the two prongs of § 371?
The offense prong punishes agreeing to commit a specific federal crime. The defraud prong punishes agreeing to impair a government function through deceit, and it does not require a financial loss to the government.
Sources
- 18 U.S.C. § 371, U.S. Code
- Department of Justice, Prosecuting Criminal guidance (2013)
- Justice Manual, 923. 18 U.S.C. § 371 Conspiracy to Defraud
- Criminal Tax Manual, Chapter 23 (2012)
- Criminal Tax Manual, conspiracy elements and penalties
- Third Circuit Model Criminal Jury Instructions, Chapter 6 (2026)
- Ninth Circuit Model Instruction 8.20, Conspiracy Elements
- DOJ plea filing, penalties and special assessment
- DOJ plea agreement, supervised release
- Justice Manual, 652. Statute of Limitations for Conspiracy
- United States v. Fumo, 628 F. Supp. 2d 573
- Federal Rule of Criminal Procedure 12