The family of Jimmy Hoffa is appealing to FBI Director Kash Patel to keep the labor leader's decades-old missing person case active and to disclose all information the bureau possesses regarding his disappearance. The plea comes as the 51st anniversary of his vanishing on July 30, 1975, nears.

"We, and likely many other Americans, would rather have the case solved, not shelved," James Hoffa, son of the former Teamsters president, told Fox News Digital. "We want the case solved. The family wants to have accountability for this horrible crime. We want the case solved so that the family can have closure."

In a letter to Director Patel, James Hoffa and his sister, Barbara Crancer, expressed that closing the case would be "disturbing." They urged the FBI to make public all details concerning Hoffa's disappearance, asserting, "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."

Jimmy Hoffa was last seen on July 30, 1975, at the Machus Red Fox restaurant in Bloomfield Hills, Michigan, preparing to meet individuals he believed would help him regain the presidency of the Teamsters union. He vanished after getting into a car. His remains have never been found, and no charges have ever been filed in connection with his disappearance.

Speculation surrounding his fate has persisted for years. One theory, detailed in the documentary series "Riddle, The Search for James R. Hoffa," suggests Hoffa was killed at a mob-controlled property and his remains were disposed of in a sanitation facility. The theory posits that he was to meet with Detroit mob figures Anthony "Tony Jack" Giacalone and Anthony "Tony Pro" Provenzano, a rival union leader.

According to Fox Nation reports, an informant told the FBI that they witnessed Hoffa's death and identified Vito "Billy Jack" Giacalone as the perpetrator. This information would have been documented in FBI reports known as 302s, but has not been publicly released.

The FBI stated in a release to Fox News Digital that it is "dedicated to deliver[ing] transparency to the American public" and views the release of historic files on Hoffa's disappearance as a step in that direction. However, many of the thousands of documents previously released have been heavily redacted.

James Hoffa suggested that unredacted files could be transferred to the National Archives without necessitating the closure of the investigation. "We want the case solved, we don’t want tons of redacted paper sent to us," he stated.

The FBI's Detroit field office is currently managing the case, with a spokesperson affirming that the bureau "continues to take the investigation seriously." The spokesperson added that the FBI has "worked for five decades to investigate every lead and process evidence related to this investigation," and expressed appreciation for the public and the Hoffa family's ongoing support.

"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.