A maxi trial is a single criminal proceeding in which dozens or even hundreds of defendants are prosecuted together for their roles in the same criminal organization. The term comes from Italy, where the 1986 Palermo Maxi Trial put more than 450 alleged members of the Sicilian Mafia before one court in a purpose-built bunker courtroom. Instead of prosecuting mob members one crime at a time, a maxi trial treats the organization itself as the target and layers individual charges onto proof of the group’s structure. The format still shapes how Italy prosecutes organized crime today, and it remains the reference point whenever any legal system tries to dismantle a criminal network from the top down.
The Palermo Trial That Named the Format
The trial that gave the concept its name opened on February 10, 1986, in Palermo, Sicily. Prosecutors had indicted roughly 475 people on charges spanning murder, drug trafficking, extortion, and membership in a mafia-type criminal organization. Investigating magistrates Giovanni Falcone and Paolo Borsellino had spent years assembling around 40 volumes of evidence documenting how the Sicilian Cosa Nostra actually operated.
The case turned on the testimony of Tommaso Buscetta, the first senior Mafia figure to break the code of silence known as omertà . Starting in 1984, Buscetta told Falcone that Cosa Nostra was run by a centralized governing body called the Cupola, or Commission, which coordinated activity across Sicilian clans. His cooperation, along with statements from other pentiti (collaborators), gave prosecutors what they needed to charge the leadership as a leadership, rather than chasing individual crimes in isolation.
Verdicts came down on December 16, 1987. The court convicted 338 defendants and handed 19 of them life sentences, then Italy’s maximum penalty. Appeals ran for years, with some convictions overturned at the intermediate level. On January 30, 1992, Italy’s Supreme Court of Cassation issued its final ruling, confirming the core convictions and reversing many of the earlier acquittals. That ruling settled, as a matter of Italian law, that the Sicilian Mafia existed as a structured criminal organization with centralized command.
Article 416-Bis and the Crime of Mafia Association
The legal engine behind every Italian maxi trial is Article 416-bis of the Italian Penal Code, which makes membership in a mafia-type organization a standalone crime. Anyone who belongs to an association of three or more people that uses intimidation, the bonds of membership, and enforced silence to commit crimes or control economic activity faces ten to fifteen years in prison. Leaders and organizers face twelve to eighteen years, and the penalties climb further if the group is armed or uses crime proceeds to finance its operations.1United Nations Office on Drugs and Crime. Article 416-416ter
Before 416-bis was enacted in 1982, Italian law required prosecutors to prove a specific criminal act by a specific defendant. After it passed, they could charge someone with belonging to the organization itself, using evidence about the group’s structure, rules, and culture of intimidation. The statute explicitly reaches the Camorra, the ‘Ndrangheta, and any other group that operates through the same methods regardless of its local name.1United Nations Office on Drugs and Crime. Article 416-416ter
The practical result is that one prosecutor can bring one case covering an entire network. Because every defendant is charged with participating in the same organization, the evidence against any one member overlaps naturally with the evidence against others. Trying them separately would mean presenting the same organizational proof dozens of times, with the added risk that different courts might reach contradictory conclusions about whether the organization existed at all.
How Hundreds of Defendants End Up in One Case
The procedural mechanism that allows hundreds of defendants to be joined into one trial is Article 12 of Italy’s Code of Criminal Procedure, which defines when proceedings are “connected.” Cases are linked when multiple people committed a crime together, when one person committed several crimes as part of a single plan, or when some crimes were committed to carry out or conceal others.2Normattiva. D.P.R. 22 Settembre 1988, N. 447 – Approvazione del Codice di Procedura Penale
In a maxi trial, prosecutors argue that the organization functions as a single entity. The murder committed by one clan to enforce the Commission’s authority, the drug trafficking run by another, and the extortion operated by a third are all connected because they serve the same organizational purpose. Establishing that the organization exists and how it operates becomes the foundation of the case, and individual charges are layered on top of that proof.
The Bunker Courtroom
No ordinary courthouse can hold a trial with hundreds of defendants, so Italian authorities built specialized facilities known as aule bunker (bunker courtrooms). The most famous was constructed next to the Ucciardone prison in Palermo specifically for the 1986 trial. Workers completed the reinforced concrete structure in roughly 200 days. Its octagonal design and armored pillars were built to withstand attack, and defendants were transported from their cells through an underground tunnel that prevented any contact with the outside world before proceedings began.
Inside, the courtroom was built to hold approximately 300 defendants at once in reinforced steel cages lining the sides of the hall. Over 200 defense attorneys, the prosecutorial team, a panel of judges, and hundreds of journalists and observers filled the remaining space. Large monitors and audio systems allowed everyone in the room to follow the proceedings. The Palermo aula bunker still stands, its original steel cages and judicial bench preserved.
Security at these facilities goes well beyond what any normal court requires. Multiple checkpoints, armed escorts, and strict access controls reflect the genuine threat criminal organizations pose to participants. Witnesses who cooperated with prosecutors were at particular risk, and the fortified design was as much about protecting them and the judges as it was about preventing escapes.
Managing Hundreds of Defense Attorneys
Coordinating the defense of hundreds of people in a single case is an administrative challenge that can easily derail the trial. Courts running maxi trials typically require defense attorneys to coordinate on shared motions so the bench doesn’t rule on identical requests dozens of times. When all defendants want to challenge the same piece of evidence or procedural decision, one attorney argues the point on behalf of the group.
Cross-examination is the most time-consuming phase. With potentially hundreds of lawyers wanting to question key witnesses, courts impose scheduling requirements and sometimes limit the duration of questioning to keep the trial from stretching into decades. Attorneys often must register their intent to cross-examine in advance so the court can organize questioning efficiently. Balancing each defendant’s individual right to challenge the evidence against the practical need to finish the trial is the central tension of the whole proceeding.
Paperwork in a case with hundreds of parties requires dedicated administrative staff and digital filing systems. Every motion, every court order, and every piece of evidence must be served on every defendant’s counsel. The Palermo Maxi Trial generated thousands of pages of filings before the first witness took the stand, and the final written judgment ran to thousands more. These trials measure their timelines in years, not months.
Verdicts and Appeals
When evidence and arguments close, the panel of judges enters a deliberation chamber known as the camera di consiglio. Deliberations can last weeks or months because the judges must produce a written ruling addressing the charges against every individual defendant. The resulting judgment, called a sentenza, often spans thousands of pages and contains the court’s legal reasoning for each conviction and each acquittal.
Once deliberations end, the judges return to the courtroom and read the verdicts in a public session. The reading can take hours as the court works through the list of defendants, announcing each outcome and, for those convicted, their sentence. Penalties range from a few years for peripheral involvement to life imprisonment for leaders found responsible for murders or for directing the organization’s operations.
The appeals process in Italy’s three-tier system means the story doesn’t end with the first verdict. Cases move to an appellate court for a full rehearing of the evidence, and then to the Court of Cassation for a final review of legal questions. In the Palermo case, that process ran from 1987 to 1992. The intermediate appellate court overturned some convictions, but the Court of Cassation’s final ruling restored most of them.
Does the United States Have Maxi Trials?
Not by that name. Federal prosecutors pursue conceptually similar mass prosecutions through the Racketeer Influenced and Corrupt Organizations Act. RICO makes it illegal to participate in the affairs of an enterprise through a pattern of racketeering activity, and it allows conspiracy charges against anyone who agrees to do so.3Office of the Law Revision Counsel. 18 USC 1962 – Prohibited Activities The underlying “racketeering activity” is defined broadly enough to sweep in conduct from murder and kidnapping to mail fraud and money laundering, so a single RICO indictment can consolidate very different criminal acts under one prosecution.4Office of the Law Revision Counsel. 18 USC 1961 – Definitions
Federal Rule of Criminal Procedure 8(b) permits joinder when defendants allegedly participated in the same act or series of acts.5Justia. Fed. R. Crim. P. 8 – Joinder of Offenses or Defendants RICO cases satisfy this rule easily because every defendant is alleged to have participated in the same enterprise. The result is indictments with ten, twenty, or more defendants facing a single jury. These cases rarely reach the scale of an Italian maxi trial, but the logic is the same: prove the organization exists, then prove each defendant’s role within it.
A defendant swept into a joint federal case can ask the court for severance under Federal Rule of Criminal Procedure 14.6Legal Information Institute. Rule 14 – Relief from Prejudicial Joinder The Supreme Court set the standard in Zafiro v. United States, holding that severance should be granted only when there is a serious risk that a joint trial would compromise a specific trial right or prevent the jury from making a reliable judgment about guilt or innocence.7Library of Congress. Zafiro v. United States, 506 U.S. 534 Courts generally prefer to manage prejudice through limiting instructions rather than splitting the case, so most severance motions in large prosecutions fail.
The largest constitutional pressure point in U.S. joint trials is the rule from Bruton v. United States. When a co-defendant’s confession incriminates another defendant, and the co-defendant doesn’t testify, the other defendant has no way to cross-examine the person whose statement is being used against them. The Court held that admitting such a confession violates the Confrontation Clause of the Sixth Amendment, even if the judge instructs the jury to consider the confession only against the person who made it.8Justia. Bruton v. United States, 391 U.S. 123 In a case with many defendants and multiple cooperating witnesses, Bruton problems multiply, and getting them wrong can cost convictions on appeal.
Maxi Trials Are Still Happening
The format didn’t end with Palermo. In November 2024, an Italian tribunal concluded a massive trial targeting the ‘Ndrangheta, Calabria’s powerful organized crime syndicate. The court convicted 207 defendants and sentenced them to a combined 2,100 years in prison, while acquitting 131 others. The charges covered drug and arms trafficking, extortion, and mafia association under Article 416-bis. Proceedings were held in a bunker-style courtroom in Lamezia Terme. The investigation was led by prosecutor Nicola Gratteri and targeted twelve clans linked to convicted ‘Ndrangheta boss Luigi Mancuso.
The Palermo trial’s core innovation, treating an entire criminal organization as a single prosecutable entity, remains the template. Prosecutors still build their cases around the organizational structure first, then attach individual crimes to specific defendants within that framework. The costs are enormous, the timelines run for years, and the constitutional tensions are real, but for criminal organizations that operate as governments unto themselves, no smaller proceeding has proven adequate.