Hub-and-Spoke vs. Chain Drug Conspiracies – The Multiple Conspiracy Defense

When the federal government charges one large drug conspiracy but the evidence actually shows several smaller, separate ones, that mismatch can be the most powerful defense in the case.

This is called a variance, and under the Supreme Court’s ruling in Kotteakos v. United States, 328 U.S. 750 (1946), it can lead to reversal of a conviction or even outright acquittal.

Federal prosecutors in the Northern District of Texas often build sweeping drug conspiracy indictments that lump together loosely connected people, and understanding the difference between a hub-and-spoke conspiracy and a chain conspiracy is the key to challenging that approach.

This article explains the multiple conspiracy defense in federal drug cases, how Dallas federal courts treat hub-and-spoke and chain conspiracy theories, and what a drug conspiracy indictment must actually prove to support a single overarching charge.

What Is the Multiple Conspiracy Defense in Federal Drug Cases?

The multiple conspiracy defense argues that the government charged one big drug conspiracy but the evidence at trial only proves several smaller, unrelated conspiracies.

When that happens, there is a legal mismatch called a variance between what the indictment says and what the proof shows.

If the variance is serious enough to affect a defendant’s substantial rights, the conviction must be reversed under Kotteakos v. United States, 328 U.S. 750 (1946).

The defense is most powerful in large federal drug prosecutions in the Northern District of Texas, where one indictment may name a dozen or more defendants who barely know each other, and where the same doctrine also reaches healthcare fraud and white collar conspiracies built on similar structures.

According to the U.S. Sentencing Commission, 18,029 federal drug trafficking cases were sentenced in fiscal year 2024, and 54.6% of those defendants were convicted of an offense carrying a mandatory minimum penalty.

Many of those cases were charged as conspiracies, which makes the single-versus-multiple conspiracy issue one of the most consequential battles in federal drug court today.

Each defendant has the right to be tried only for the drug conspiracy he actually joined, not for a sprawling distribution network that the government dressed up as a single agreement.

The Supreme Court in Kotteakos explained that criminal guilt “remains individual and personal, even as respects conspiracies,” and is not a matter of mass application.

That principle is the foundation of every multiple conspiracy challenge filed in Dallas federal drug cases today.

How Is a Hub-and-Spoke Drug Conspiracy Different From a Chain Drug Conspiracy?

A hub-and-spoke drug conspiracy has one central person (the hub) who deals separately with several outside people (the spokes), while a chain drug conspiracy is a vertical operation where each link knows the others must exist for the scheme to work.

Feature	Hub-and-Spoke Drug Conspiracy	Chain Drug Conspiracy
Structure	One supplier or broker dealing separately with multiple independent buyers	Vertical drug operation with successive links from supplier to street-level distributor
Connection between participants	Spokes do not interact with each other	Each link knows the others must exist for the drug operation to work
Required for single conspiracy	A “rim” connecting the spokes through shared agreement	Mutual dependence and interdependence among levels of the drug chain
Leading case	Kotteakos v. United States (1946)	United States v. Bruno (1939)
Common context	One supplier with many independent buyers who never coordinate	Federal drug trafficking with suppliers, middlemen, and distributors
Risk if government overcharges	Conviction reversed for variance	Single drug conspiracy charge usually upheld

The legal difference is whether the spokes are connected to each other by a “rim.”

If there is no rim, then under Kotteakos there is no single drug conspiracy, only multiple separate conspiracies that happen to share a common middleman.

A chain conspiracy is the model the Second Circuit described in United States v. Bruno, 105 F.2d 921 (2d Cir. 1939), where smugglers, middlemen, and retailers each knew that the unlawful drug business could not start with their sellers or stop with their buyers.

In that situation, every level depends on the next, so the law treats the entire drug operation as one conspiracy even if the people at opposite ends never meet.

Federal prosecutors in Dallas frequently try to dress up hub-and-spoke arrangements as chain drug conspiracies because chain theories are much easier to charge as one big case.

The defense job is to expose the missing rim and force the government to prove actual interdependence among all of the alleged drug conspirators.

When Is a Hub-and-Spoke Arrangement Really Multiple Drug Conspiracies?

A hub-and-spoke arrangement is really multiple conspiracies when the spokes have no agreement, no shared stake, and no working knowledge of each other’s transactions.

The Supreme Court drew this line clearly in Kotteakos, where 32 defendants were charged with a single conspiracy to obtain fraudulent loans through one broker named Simon Brown.

The evidence proved eight or more separate conspiracies, each between Brown and a different group of borrowers, with no connection among the borrower groups other than Brown’s role as broker.

The Court reversed the convictions because trying everyone together let the jury transfer guilt across unrelated defendants.

In modern Dallas federal drug cases, this same problem comes up when the government charges a single drug conspiracy involving one supplier and many independent buyers who never coordinated with one another.

If those buyers had no role in each other’s drug transactions and shared no profits or losses, they were not part of a single drug conspiracy under federal law.

The defense should move to dismiss the indictment, request a multiple conspiracy jury instruction, and preserve the issue for appeal under the Kotteakos standard.

When Does a Chain Conspiracy Hold Up as a Single Agreement?

A chain conspiracy holds up as a single drug conspiracy when each participant knows that the success of his role depends on the success of every other link in the operation.

In Bruno, the Second Circuit found a single drug conspiracy among smugglers, middlemen, and retailers because the smugglers had to know there were retailers and the retailers had to know there were importers, even though they never communicated directly.

The interdependence among the levels created a “community of interest” that satisfied the single conspiracy requirement.

The Supreme Court applied a similar analysis the next year in Blumenthal v. United States, 332 U.S. 539 (1947), where defendants in a black-market sales scheme shared a single overall purpose even though some of them did not know the identity of every other participant.

Federal drug cases out of North Texas often fit this chain model when there is a clear vertical structure of suppliers, transporters, and street-level distributors who depend on each other to move product.

But a chain theory collapses if the government cannot prove that each link in the drug operation knew the rest of the chain existed and intended to further the broader operation.

How Does a Variance Between Indictment and Proof Lead to Reversal?

A variance leads to reversal when the difference between the drug conspiracy charged and the conspiracies actually proved affected the defendant’s substantial rights at trial.

The Fifth Circuit applies a two-step test taken from cases like United States v. Morris, 46 F.3d 410 (5th Cir. 1995).

First, the defendant must show an actual variance between the single conspiracy alleged in the indictment and the multiple conspiracies shown by the evidence.

Second, the defendant must show that the variance prejudiced him, usually because the jury heard inflammatory evidence about other people’s crimes that would not have been admitted in a properly limited trial.

The Supreme Court in Kotteakos described the danger this way: when one conspiracy is charged but eight are proved, the “sheer difference in numbers” makes it nearly impossible for a jury to keep the evidence straight, and guilt can transfer from one defendant to another by psychological effect.

In a Dallas federal drug trial with multiple defendants, a defense lawyer must watch closely for evidence that should be admitted only against certain co-defendants but ends up coloring the jury’s view of every defendant in the courtroom.

When that happens, the variance argument becomes the strongest issue on appeal, particularly if the trial judge refused a multiple conspiracy jury instruction.

What Does the Fifth Circuit Require to Find a Single Conspiracy?

The Fifth Circuit requires evidence of an agreement between two or more people, knowledge of the agreement, and voluntary participation by each defendant before it will affirm a single drug conspiracy verdict.

In United States v. Gaytan, 74 F.3d 545 (5th Cir. 1996), a large-scale cocaine prosecution out of Texas, the court explained that a single conspiracy will be inferred when the activities of one part of the scheme are necessary or advantageous to the success of another part or to the overall venture.

The court looks at whether there was a common goal, whether the nature of the scheme suggested mutual dependence, and whether the participants overlapped in any meaningful way.

If those three factors are missing, the indictment falls into Kotteakos territory and the variance argument grows much stronger.

Texas drug cases prosecuted in the Northern, Eastern, Southern, and Western Districts often involve large indictments with many defendants, and the Fifth Circuit has repeatedly examined whether the proof supports one umbrella drug conspiracy or several distinct ones.

A skilled defense team will press the prosecution at every stage to identify exactly what the alleged single agreement was and which acts furthered it.

When the government cannot draw those lines clearly, the case for multiple drug conspiracies becomes much harder to dispute.

Why Does the Multiple Conspiracy Jury Instruction Matter So Much?

The multiple conspiracy jury instruction matters because it tells the jury that if the evidence shows separate drug conspiracies instead of the single one charged, the jury must consider that mismatch when deciding guilt.

The Fifth Circuit’s pattern criminal jury instructions include a specific charge on multiple conspiracies for cases where the defense has raised the issue and the evidence supports it.

Without that instruction, jurors hearing weeks of evidence about many drug defendants tend to assume that everyone in the courtroom is connected, and the protection Kotteakos was designed to provide simply disappears.

A trial court’s refusal to give the instruction, when the evidence supports it, can itself be reversible error in the Fifth Circuit.

In a complex federal drug conspiracy trial in Dallas, the defense lawyer must request the instruction in writing, build the evidentiary record to support it, and renew the request after the close of evidence.

The same instruction also forces the prosecution to argue the case more carefully, since the jury is now openly weighing whether one big agreement actually existed.

This is one of the most important strategic choices a defense team makes in a federal multi-defendant drug conspiracy trial.

What Other Defenses Pair Well With a Multiple Conspiracy Argument?

Several defenses pair well with a multiple conspiracy argument because they all attack the same core weakness in the government’s case, which is the assumption that everyone charged was part of one shared agreement.

The buyer-seller defense is one of the strongest in federal drug conspiracy cases, and the Fifth Circuit has held that a simple purchase relationship by itself does not prove a conspiracy to distribute drugs.

A mere presence defense argues that a defendant just happened to be near criminal activity but never agreed to join it, and the Fifth Circuit Pattern Jury Instructions specifically address that situation.

A withdrawal defense, where a defendant claims he left the conspiracy before key acts occurred, can also limit liability for events that came after withdrawal and may shield him from co-conspirator liability under Pinkerton v. United States, 328 U.S. 640 (1946).

Combining these defenses, while avoiding the top 10 defense mistakes in federal conspiracy cases, gives the defense team several different ways to attack the indictment without contradicting any single theme.

The goal is to show that the government overcharged the case, lumped innocent or peripheral people in with serious offenders, and ignored the real boundaries of any actual agreement.

In my Dallas federal practice, I have seen these layered defenses produce acquittals, dismissals, and sharply reduced sentences in cases that initially looked impossible.

How Does a Variance Defense Affect Drug Conspiracy Sentencing?

A variance defense affects sentencing because the size and scope of the drug conspiracy directly drives the federal sentencing guidelines calculation.

When the court treats a defendant as part of one massive drug conspiracy, the drug quantity attributed to him can balloon based on what every other co-conspirator distributed.

If the defense can show that the defendant was actually only part of a smaller, separate conspiracy, the court may attribute far less drug weight to him at sentencing.

This is sometimes called scope analysis, and it follows from the relevant conduct rules in the United States Sentencing Guidelines.

A successful variance argument at trial may also lead to sentencing reductions even when conviction stands, because the judge can use the same evidence to limit the offense level and any role enhancements.

In federal drug conspiracy cases out of the Northern District of Texas, this scope reduction can mean the difference between a guidelines range of decades and one of just a few years.

That is why pressing the multiple conspiracy issue from the start of the case, not just at trial, is so important for Dallas federal drug defendants.

How Does the Government Try to Hold a Single Drug Conspiracy Theory Together?

The government tries to hold a single drug conspiracy theory together by emphasizing common goals, overlapping methods, and shared communication channels among all the alleged participants.

Prosecutors point to wiretap calls, recorded meetings, drug ledgers, money flows, and cooperator testimony in an effort to draw a single circle around everyone in the indictment.

In drug cases, the government often argues that all of the defendants were working toward a common end, namely the distribution of a particular controlled substance in North Texas, and that everyone benefited from the success of the larger operation.

The same playbook shows up in healthcare fraud and PPP fraud prosecutions, where coordination through a single broker or marketer is offered as proof of one big agreement.

The defense response is to focus on what the proof actually shows about each individual defendant’s knowledge and agreement in the alleged drug conspiracy, not on what looks suspicious in the aggregate.

Even strong-looking circumstantial evidence often falls apart on cross-examination when the defense isolates the actual drug transactions each defendant participated in.

When that happens, the carefully constructed single drug conspiracy theory begins to look much more like the kind of mass prosecution the Supreme Court rejected in Kotteakos.

Get Help With a Federal Drug Conspiracy Charge in Dallas

If you are facing a federal drug conspiracy indictment, the difference between one charged conspiracy and several proven conspiracies can change the outcome of your entire case.

As a board certified federal criminal defense attorney in Dallas, Michael Lowe has handled multi-defendant drug conspiracy prosecutions in the Northern, Eastern, Southern, and Western Districts of Texas, including cases that turned on Kotteakos and Bruno-style arguments.

Contact the Law Office of Michael Lowe today by calling 214-526-1900 for a free consultation about your case.

Frequently Asked Questions

What is a hub-and-spoke drug conspiracy in federal court?

A hub-and-spoke drug conspiracy is a structure where one central person, the hub, deals separately with multiple outside people called spokes, who do not interact with each other. Under Kotteakos v. United States, 328 U.S. 750 (1946), this arrangement is treated as multiple separate drug conspiracies unless the government also proves a “rim” connecting the spokes through shared knowledge, mutual dependence, and a common agreement.

What is a chain drug conspiracy and how is it different?

A chain drug conspiracy is a vertical operation, common in federal narcotics cases, where suppliers, middlemen, and distributors each know the others must exist for the scheme to work. Under United States v. Bruno, 105 F.2d 921 (2d Cir. 1939), this kind of interdependence supports one single drug conspiracy charge even when participants at opposite ends of the chain never meet or communicate directly with each other.

What is the multiple conspiracy defense in a federal drug case?

The multiple conspiracy defense argues that the government charged one large drug conspiracy but the evidence at trial actually proves several smaller, separate ones. When this variance affects the defendant’s substantial rights, the Supreme Court’s decision in Kotteakos requires reversal. The defense is especially powerful in large federal drug prosecutions where many loosely connected defendants are charged together in one indictment.

Can a federal drug conspiracy conviction be reversed for a variance?

Yes, a federal drug conspiracy conviction can be reversed if there is a real variance between the single conspiracy charged and the multiple conspiracies proved, and that variance affected the defendant’s substantial rights. The Fifth Circuit applies this standard from Kotteakos and cases such as United States v. Morris, 46 F.3d 410 (5th Cir. 1995). Reversal usually requires proof that inflammatory evidence about other defendants prejudiced the trial.

Why does the multiple conspiracy jury instruction matter in drug cases?

The multiple conspiracy jury instruction matters because it directs jurors to acquit if they find separate drug conspiracies instead of the single one charged. Without it, jurors typically assume every defendant in a large drug indictment is connected. The Fifth Circuit pattern jury instructions provide language for this charge, and a trial court’s refusal to give the instruction when the evidence supports it can be reversible error on appeal.

How does a multiple conspiracy argument affect drug sentencing?

A multiple conspiracy argument affects drug sentencing because the federal sentencing guidelines tie offense levels to the scope of the conspiracy. If a court attributes only a smaller, separate drug conspiracy to a defendant rather than a large overall scheme, drug quantities and role enhancements all shrink. This scope analysis under the relevant conduct rules can dramatically reduce a federal drug sentence, even when the defendant is convicted on the conspiracy count.