Federal Bureau of Investigation

The Federal Bureau of Investigation occupies two connected roles in the book: it is a national investigative institution whose methods helped transform the federal campaign against organized crime, and it is the agency whose files, witnesses, and forensic findings shaped the long inquiry into Jimmy Hoffa’s disappearance. The narrative credits its investigative reach with making the Hoffa case a sustained national effort, but also presents disputes over informants, disclosure, and the meaning of physical evidence that prevented investigation from becoming an uncomplicated verdict.

National reach and investigative method

In its account of the campaign led by Bobby Kennedy, the book identifies a method that outlasted any single prosecution: intelligence gathering, focused targets, informant agreements, sophisticated electronic surveillance, and the pooling of information across government agencies that might otherwise compete. The significance attributed to this approach is institutional as well as tactical. Organized crime came to be treated as a federal concern rather than merely a local police problem, and the book describes the damage to criminal power and mob influence in the Teamsters as irreversible, even though organized crime itself endured.

That institutional model provides the context for the later attention paid to Jimmy Hoffa and the union. During the Nashville Test Fleet trial, the Get Hoffa Squad placed Edward Grady Partin in Hoffa’s entourage and furnished him with a recording device for calls. Walter Sheridan said that he also instructed Partin to watch for attempts to bribe jurors. The distinction mattered: the trial charge concerned a misdemeanor, while evidence of jury tampering could expose a felony. The investigative operation therefore sought not only evidence about the underlying Test Fleet business but also evidence of an alleged continuing crime that could change the stakes of the case.

Informants, surveillance, and contested procedure

The use of Partin became a constitutional and procedural controversy when he appeared as the government’s final witness in the later Chattanooga jury-tampering trial. The defense argued that he had been planted inside its camp and that his presence violated Hoffa’s right to counsel. The government maintained that Partin had volunteered to attend, reported to Sheridan rather than to prosecutors, and passed along evidence only about jury tampering—not information about the Test Fleet case or Hoffa’s defense. After a four-hour hearing, the judge accepted the government’s account and allowed Partin to testify. Partin then described Hoffa’s reported boasts about attempted bribes, including efforts he said had been discussed before or while they occurred.

The trial presented the agency’s investigative practices as effective and legally disputed at once. Prosecutor James Neal argued that the government had checked Partin’s account against events and found that what Partin said was happening, and what he said would happen, did happen. The defense, by contrast, portrayed Sheridan as the architect of a plot against Hoffa. The Supreme Court later considered whether Partin’s presence at the Andrew Jackson Hotel had violated Hoffa’s constitutional right to counsel. It ruled against Hoffa on the merits, while Chief Justice Earl Warren dissented and criticized the government’s clandestine use of Partin. The book thus distinguishes the court’s ruling from the continuing dispute over the fairness of the investigative method.

The disappearance investigation and the HOFFEX file

After Hoffa disappeared, the Federal Bureau of Investigation assigned 200 agents to the case and compiled seventy volumes, totaling more than 16,000 pages, known as the HOFFEX file. The book identifies an initial group of seven men in an early memorandum and adds Tony Giacalone and Chuckie O’Brien to make nine suspects. The agency’s conviction that this small group had abducted and killed Hoffa is conveyed through statements by former Detroit officials who said they believed they knew who was responsible. All nine appeared before a Detroit federal grand jury six weeks after the disappearance; they took the Fifth, and they were represented by Bill Bufalino. Frank Sheeran invoked the privilege on every question put to him, even one about the color of the prosecutor’s pen. Stephen Andretta, after receiving limited immunity, initially refused to answer and spent sixty-three days in jail for contempt before agreeing to testify.

The scale of the inquiry sits beside the book’s pointed question about how investigators came to focus so persistently on those suspects. Its narrator asks who might have been speaking to the government, but the question is not itself proof that any particular suspect supplied information. The account also describes an underworld warning system: Russell Bufalino cautioned Sheeran to report visits to federal buildings, even when responding to a subpoena, and Sal Briguglio was confronted after word reached his associates that he had met with the agency. These passages depict surveillance and counter-surveillance as part of the case’s social environment, without establishing precisely how information moved between the criminal network and investigators.

Disclosure disputes and the public case

The agency’s continuing possession of the HOFFEX file became a separate issue after the investigation was transferred to Oakland County on March 29, 2002. David Gorcyca, the county prosecutor, made at least three requests beginning in June 2004 for portions concerning Sheeran, Sal Briguglio, and the Andretta brothers. The requested material was not released. Gorcyca also asked federal authorities to convene a grand jury to hear from two surviving participants identified by Sheeran, Tommy Andretta and Chuckie O’Brien; that request was denied. The book presents these refusals as a serious limit on local follow-up, particularly because the county had no standing grand jury of its own.

Public reporting and the book’s claims also intersected with the agency’s forensic work. In 1999, Sheeran told the author that he had lured Hoffa into the rear passenger seat of a maroon Mercury, despite Hoffa’s preference for the front passenger seat. The driver, Chuckie O’Brien, denied that Hoffa had been in the car and passed a lie-detector test, but the book says the agency had already undermined O’Brien’s alibi. On September 7, 2001, the Federal Bureau of Investigation announced that a hair recovered from the rear passenger-side headrest had been DNA-tested and identified as Hoffa’s. That result supported the account that Hoffa had been in the car; it did not by itself establish what happened after the pickup.

Forensic findings and unresolved interpretation

In February 2002, Sheeran and the author found the Detroit house where Sheeran said he had shot Hoffa. They reported that its location and exterior matched his description. Before the book’s first edition appeared, Fox News arranged for specialists to apply Luminol to the floorboards. The test revealed eight small indications of blood along a trail from the vestibule down the hallway toward the kitchen, a pattern the book said matched Sheeran’s account. The initial test could not provide enough material for DNA analysis, and the possibility of cleaning, the passage of nearly twenty-nine years, and other explanations limited what the result could prove.

The Bloomfield Township Police Department later removed sections of flooring and sent them to the FBI Laboratory. On February 15, 2005, the department announced that testing found human male blood but that its DNA did not match Hoffa’s. Gorcyca emphasized that the result neither corroborated nor refuted Sheeran’s confession. Michael Baden, a forensic pathologist, argued that the blood evidence supported the manner of killing described in the confession, while the book also acknowledges that the blood might have come from an unrelated source. The agency’s contribution was therefore both concrete and bounded: it identified a hair as Hoffa’s and tested blood from the house, but the blood result did not identify Hoffa and could not settle the case alone. In the book’s final reckoning, the evidence is cumulative but not interchangeable: a confirmed hair, a house matching the account, and blood that was human but not Hoffa’s each bear differently on the claim, leaving the disappearance unresolved rather than converting suspicion into a conclusive forensic finding.