Jimmy Hoffa's family is pressing FBI Director Kash Patel to keep the legendary labor leader's missing-person case open and release the bureau's buried files — and the answer will tell ordinary Americans whether the new director can break a half-century wall of institutional silence, or whether Washington protects its own once again.

Fifty-one years after Hoffa vanished from a Michigan parking lot, his son James and daughter Barbara Crancer have written directly to Patel asking him not to shelve the case. They want names — even if the people behind the disappearance are dead.

"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," James Hoffa wrote in the letter, obtained by Fox News Digital. "My sister Barbara and I urge the FBI to keep the case open and active, and to continue the investigation."

The stakes are straightforward. The FBI has sat on informant testimony for decades. According to Fox Nation's documentary series "Riddle, The Search for James R. Hoffa," an informant told the bureau he was present when Hoffa died and identified Detroit mob capo Vito "Billy Jack" Giacalone as the killer. That testimony would have been documented in FBI 302 files. It has never been made public.

Hoffa disappeared July 30, 1975, after arriving at the Machus Red Fox restaurant in Bloomfield Hills, Michigan. He believed he was meeting with powerful Detroit mobster Anthony "Tony Jack" Giacalone and New Jersey Teamsters local president Anthony "Tony Pro" Provenzano — a Genovese crime family capo whose 10,000-member local Hoffa needed to retake the union presidency. He was last seen getting into a car around 2:30 p.m. His remains have never been found. No one has ever been charged.

The Fox Nation documentary lays out a theory: Hoffa was picked up by Vito Giacalone and mobster Anthony "Tony Pal" Palazzolo, driven to a home owned by mobster Carlo Licata, killed, and his remains disposed of at a mob-run sanitation facility in Hamtramck. Whether that account is accurate or not, the FBI has documentation it has never released.

"We, and likely many other Americans, would rather have the case solved, not shelved," James Hoffa told Fox News Digital. "I'm shocked that the government would close such a prominent case. This case is of national interest to all, and all the efforts of the FBI should continue to go to solving it."

He added: "We seek closure, not millions of documents that continue the mystery."

The current status of the criminal case is unclear. The FBI, in a statement to Fox News Digital, said it is "dedicated to deliver[ing] transparency to the American public" — the kind of generic bureau language that has preceded decades of stonewalling.

Both the New York Post and Fox News covered the family's appeal identically, with the Post drawing heavily from Fox's reporting. Neither pressed the bureau on what it would actually take to release the 302s, or whether Patel has reviewed the files.

The real question isn't what happened to Jimmy Hoffa. It's whether Kash Patel — brought in to overhaul a bureau that spent years covering for itself — will force the release of documents the FBI has hidden for 50 years, or whether the institutional reflex to protect old secrets proves stronger than one director's promises. The Hoffa family just put that question squarely on Patel's desk.