The family of legendary labor leader Jimmy Hoffa is pressing the FBI to keep his decades-old disappearance case active, calling for the bureau to reveal all it knows about his fate and to "name names" of those responsible, even if deceased. The plea comes as the 51st anniversary of his 1975 vanishing approaches.

James P. Hoffa, son of the former Teamsters president, told Fox News Digital that closing the prominent missing person case would be "shocking" and "disturbing." He expressed a desire for accountability and closure for the family, stating, "We want the case solved so that the family can have closure."

In a letter to FBI Director Kash Patel, James Hoffa and his sister, Barbara Crancer, urged the FBI to make public all information pertaining to his father's disappearance. "It is important to us, and the country, that the truth about my father's disappearance [be] told and those involved in his disappearance, even if they are deceased, be exposed," the letter stated. The siblings implored Patel to "keep the case open and active, and to continue the investigation."

Jimmy Hoffa disappeared on July 30, 1975, while en route to a meeting intended to aid his efforts to reclaim the Teamsters union presidency. He was last seen at the Machus Red Fox restaurant in Bloomfield Hills, Michigan, entering a vehicle that departed the scene. His remains have never been found, and no charges have ever been filed in connection with his disappearance.

A documentary series, "Riddle, The Search for James R. Hoffa," available on Fox Nation, explores theories regarding Hoffa's fate. One speculation suggests he was picked up at the restaurant by Detroit mob figures Vito "Billy Jack" Giaclone and Anthony "Tony Pal" Palazzolo, then taken to a home owned by mobster Carlo Licata, where he was killed. The theory posits his remains may have been disposed of at a mob-controlled sanitation facility.

Hoffa was reportedly led to believe he would be meeting with Anthony "Tony Jack" Giacalone, brother of Vito Giaclone and a powerful Detroit mobster, along with Anthony "Tony Pro" Provenzano, a rival union leader and a capo in the Genovese crime family. Provenzano's support was crucial for Hoffa's campaign for union leadership.

According to reports from the documentary series, an informant told the FBI that they were present when Jimmy Hoffa died and identified Vito "Billy Jack" Giacalone as his killer. This information would typically be documented in FBI records known as 302s, but has not been publicly released.

"We and likely many other Americans would rather have the case solved, not shelved. We seek closure, not millions of documents that continue the mystery," Hoffa's son wrote to Patel. The family has suggested that unredacted files could be turned over to the National Archives without closing the case.

The FBI stated to Fox News Digital that it is "dedicated to deliver[ing] transparency to the American public" and that the release of historic files on Hoffa's disappearance is "another step in that direction." However, previous releases of thousands of documents have been heavily redacted, obscuring potentially critical information.

The FBI's Detroit field office currently oversees the case and has indicated it remains a serious investigation. A spokesperson commented, "The FBI has worked for five decades to investigate every lead and process evidence related to this investigation. FBI offices across the country have assisted over the years and we have received countless tips and information from the public, which has been of tremendous help to the FBI. We appreciate the public, and more importantly, the Hoffa family's assistance and support over the years."

"It is time for the FBI to solve the case and to hold people accountable and name names, even if they are deceased, to solve this national mystery," James Hoffa reiterated.