What Is a Federal Conspiracy Charge Under 18 U.S.C. § 371?

A federal conspiracy charge under 18 U.S.C. § 371 accuses you of agreeing with at least one other person to commit a federal crime or to defraud the United States, when at least one member of the group took some concrete step toward carrying the plan out. The agreement itself is the crime. If convicted, you face up to five years in federal prison and fines reaching $250,000, on top of any sentence for the underlying offense the group planned.¹

What the Government Has to Prove

Three elements, each beyond a reasonable doubt: an agreement between two or more people, criminal intent, and an overt act.

The Agreement

Two or more people must reach a shared understanding to pursue an unlawful goal. No handshake, no written contract, no spoken words are required. Courts routinely find agreements from circumstantial evidence showing the participants understood they were working toward the same illegal end.¹

Criminal Intent

You must have deliberately joined the agreement with the goal of helping it succeed. Being around people who happen to be planning a crime is not enough. You need to have known about the basic illegal objective and shared it. You don’t need to know every detail of the plan or every person involved, but you must have willfully signed on to the group’s criminal purpose. Prosecutors typically prove intent through behavior: coded communications, attempts to conceal the activity, division of proceeds, or continued participation after learning what the group was doing.

The Overt Act

At least one member of the group must have taken a concrete step to advance the plan. Only one conspirator needs to perform the act, but once it happens, every member of the agreement is on the hook.¹

The act itself does not have to be illegal. A phone call, a supply purchase, renting a storage unit, driving to a meeting — any of these can qualify if the act was meant to move the conspiracy forward. It must occur after the agreement forms and before the conspiracy ends. The bar is deliberately low because the overt act exists to show the plan was real, not hypothetical.

One boundary worth knowing: drug conspiracy under 21 U.S.C. § 846 requires no overt act at all. The agreement alone is enough.² Defendants sometimes assume the § 371 overt-act requirement applies to a drug case. It doesn’t.

The Two Theories Prosecutors Can Use

Section 371 contains two paths. Courts treat them as alternative ways of committing the same single offense, not as separate crimes.³

The Offense Clause

This path covers agreements to commit any specific federal crime: wire fraud, bank robbery, tax evasion, identity theft, and so on. The prosecution ties the conspiracy to a particular statute the group intended to violate. If an indictment lists multiple target crimes, the jury must unanimously agree on which specific crime was the objective. Half the jury believing wire fraud while the other half believes bank fraud is not enough.³

The Defraud Clause

This path is broader. It covers agreements to interfere with or obstruct a federal agency’s lawful functions through dishonesty or trickery. The group doesn’t need to plan a violation of any specific criminal statute. Hiding income from the IRS, submitting false data to the EPA, or manipulating records to mislead a federal licensing agency can all fall under this clause. Prosecutors reach for it when the conduct was clearly dishonest but doesn’t map cleanly onto a single criminal provision.¹

Conspiracy Is Its Own Crime

Conspiracy is a stand-alone offense, independent of whatever crime the group was planning. You can be convicted of conspiracy even if the target crime was never completed, never attempted, or if you were acquitted of the underlying offense.³ The reverse also holds: if the group carried out the crime, participants can be convicted and sentenced for both the conspiracy and the completed offense, with sentences potentially running consecutively. The conspiracy count adds real prison time on top.

You Can Be Liable for Crimes You Didn’t Commit

Under the Pinkerton doctrine, from a 1946 Supreme Court decision, every member of a conspiracy can be held responsible for crimes committed by other members, including crimes the defendant didn’t personally commit, plan, or know about in advance. Once a criminal partnership exists, each partner’s acts in carrying it forward are attributed to all.⁴

The doctrine applies when the co-conspirator’s crime was within the scope of the conspiracy, done to advance its goals, and reasonably foreseeable as a consequence of the agreement. That last piece is where Pinkerton liability turns dangerous. If you agree to help distribute stolen goods and a co-conspirator commits armed robbery to obtain them, a court could find the robbery was a foreseeable part of the plan and hold you liable for it, with penalties far more severe than the conspiracy itself carries.⁴

Penalties

The statutory maximum for a § 371 conviction is five years in federal prison, a fine of up to $250,000 for individuals or $500,000 for organizations, or both.¹⁵ These penalties are separate from any sentence for the completed crime.

There is one built-in ceiling. If the target crime is only a misdemeanor, the conspiracy sentence cannot exceed the maximum punishment for that misdemeanor. A conspiracy to commit an offense carrying a one-year maximum is capped at one year.¹

The Federal Sentencing Guidelines drive the actual sentence within the statutory range. Your role in the operation matters. Leaders or organizers of conspiracies involving five or more participants face a four-level increase to their offense level. Managers or supervisors in similarly sized operations face a three-level increase. Organizers or leaders of smaller operations face a two-level increase. Courts don’t rely on titles; they look at who made decisions, who recruited others, who claimed a larger share of the proceeds, and who controlled the operation.⁶ Criminal history, the financial scope of the conspiracy, and the number of victims also factor in. Supervised release and restitution are common additions.

How Long the Government Has to Charge You

The general federal statute of limitations for non-capital offenses is five years.⁷ For a § 371 conspiracy, the clock starts running from the date of the last overt act committed by any member of the group, not from the date you personally last did anything.⁸

This is a trap for people who think they left a conspiracy behind years ago. If other members kept performing overt acts after your departure, the limitations clock may not have started for you until those acts ended, unless you can prove you formally withdrew.

Withdrawing From the Conspiracy

Withdrawal is an affirmative defense, and the Supreme Court has held that the burden falls on the defendant to prove it, not on the government to disprove it. You must prove withdrawal by a preponderance of the evidence.⁹

Walking away or going quiet is not enough. You must take affirmative steps inconsistent with the conspiracy’s purpose and make reasonable efforts to communicate your departure to your co-conspirators. Courts look for a definite, positive action showing you are no longer part of the group.¹⁰

Even a successful withdrawal defense has limits. Under Smith, a defendant who withdraws remains guilty of the conspiracy itself. Withdrawal cuts off liability for co-conspirators’ actions that occur after the withdrawal and can restart the statute of limitations clock in your favor.⁹ It does not erase the agreement you already joined.

1
Office of the Law Revision Counsel. 18 USC 371 – Conspiracy to Commit Offense or to Defraud United States
2
Office of the Law Revision Counsel. 21 USC 846 – Attempt and Conspiracy
3
United States Court of Appeals for the Third Circuit. Chapter 6 Final Instructions – Elements of Offenses Conspiracy 18 USC 371
4
Legal Information Institute. Pinkerton v United States
5
Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine
6
United States Sentencing Commission. Primer on Aggravating and Mitigating Role Adjustments
7
Office of the Law Revision Counsel. 18 USC 3282 – Offense Not Capital
8
U.S. Department of Justice. Criminal Resource Manual 652 – Statute of Limitations for Conspiracy
9
Justia Law. Smith v United States 568 US 106 (2013)
10
Ninth Circuit District and Bankruptcy Courts. 8.24 Withdrawal From Conspiracy