Maybe we will never know if he was here or not
Eighty years after the fall of the Third Reich, Switzerland has agreed to unseal long-classified intelligence files on Josef Mengele, the Auschwitz physician whose selections and experiments contributed to the deaths of over a million people. The decision came not from institutional conscience but from a historian's crowdfunded court challenge against a government that had locked the records until 2071. What the files may reveal is less certain than what their sealing has long implied: that Switzerland's relationship with one of history's most wanted men was complicated, and that some nations still find the past more dangerous than the present.
- For decades, Switzerland sealed files on Mengele under national security grounds, even as evidence mounted that he may have sheltered on Swiss soil after an international arrest warrant was issued in 1959.
- A historian crowdfunded 18,000 Swiss francs in days to fight the government in court — and the public pressure alone was enough to force the Federal Intelligence Service to reverse course.
- Surveillance records show Zurich police watched an apartment rented by Mengele's wife in 1961, noting an unidentified man in her company, yet no official conclusion was ever drawn or preserved in accessible form.
- Experts suspect the real secret buried in the files may not be Mengele himself but Switzerland's covert contact with Israeli Mossad during its Nazi-hunting operations — a diplomatic entanglement the government may still wish to conceal.
- Historians warn the files will likely arrive heavily redacted, with no timeline for access and 'conditions yet to be defined,' leaving the question of Mengele's Swiss refuge as unresolved as it has been for half a century.
For more than fifty years, Switzerland kept its intelligence files on Josef Mengele sealed from public view. The Nazi doctor who selected prisoners for Auschwitz's gas chambers and performed lethal experiments on children had long been suspected of finding refuge in Switzerland after the war — but the Swiss Federal Intelligence Service cited national security and family protection to justify locking the records until 2071. That position finally cracked this month, after historian Gérard Wettstein took the government to court and crowdfunded his legal challenge, raising 18,000 Swiss francs within days.
Mengele's Swiss connection began with forged paperwork. After the war, he obtained Red Cross travel documents through the Swiss consulate in Genoa and used them to reach South America in 1949. The Red Cross had issued such papers to thousands of displaced Europeans, but Nazi fugitives exploited the system systematically. What seemed like the end of the Swiss chapter was complicated by a 1956 skiing holiday Mengele took in the Alps with his son — and then, more seriously, by events in 1961. Austrian intelligence warned Swiss authorities that Mengele might be traveling under a false name on Swiss territory. Around the same time, his wife rented a modest apartment near Zurich's international airport and applied for permanent residency. Zurich police placed the flat under surveillance and noted her driving with an unidentified man. No official conclusion followed.
Historian Regula Bochsler had begun piecing this together in the 2010s while researching Switzerland's role as a transit point for fleeing Nazis. When she applied to see the federal files in 2019, she was refused. Wettstein tried again in 2025 and received the same answer before turning to the courts.
What the files might actually contain is a matter of debate among historians. Sacha Zala, president of the Swiss Society for History, suspects the secrecy has less to do with Mengele than with Switzerland's covert contacts with Israeli Mossad, which was actively hunting Nazi war criminals by the late 1950s. Jakob Tanner, a veteran of the 1990s Bergier Commission on Switzerland's wartime conduct, sees the sealed files as part of a broader pattern of institutional discomfort — a country still sensitive about turning away Jewish refugees at its borders while Swiss banks held the assets of families later murdered in the camps.
Mengele died in Brazil in 1979 and was buried under a false name; DNA testing confirmed his identity only in 1992. Whether he ever returned to Switzerland remains unproven. A historian briefly granted access to some files in 1999 concluded it was impossible to say either way — a finding that filled just a few lines of a 24-volume report before the files were sealed again. Wettstein and Bochsler both fear the coming disclosure will be heavily redacted. 'Maybe we will never get to the real truth,' Wettstein said. For now, the answer remains locked behind conditions the government has yet to define.
For more than half a century, Switzerland kept its files on Josef Mengele locked away. The Nazi doctor who became known as the Angel of Death—who selected prisoners for Auschwitz's gas chambers and performed lethal experiments on children and twins—had long been suspected of hiding in Switzerland after the war. But the Swiss Federal Intelligence Service refused to open the records, citing national security and family protection. That changed this month, after a historian took the government to court and crowdfunded his legal challenge.
Mengele's path to Switzerland began with a Red Cross document. After World War Two ended, he shed his Waffen SS uniform, adopted a false identity, and obtained travel papers from the International Red Cross through the Swiss consulate in Genoa. The Red Cross had issued such documents to thousands of displaced Europeans, but Nazi fugitives exploited the system to escape prosecution. Using these credentials, Mengele made his way to South America in 1949. For decades, that seemed to be the end of the Swiss connection. Then, in 1956, he took a skiing holiday in the Swiss Alps with his son Rolf—a fact known since the 1980s but largely forgotten.
Historian Regula Bochsler began asking harder questions in the 2010s while researching Switzerland's role as a transit point for fleeing Nazis. She discovered that in June 1961, Austrian intelligence had warned the Swiss that Mengele was traveling under an assumed name and might be on Swiss territory. Around the same time, Mengele's wife had rented an apartment in Zurich and applied for permanent residency. The location was telling: a modest suburb near the international airport, far below what the family's wealth could have afforded. Zurich police files showed the flat was put under surveillance in 1961. Officers noted Mrs. Mengele driving a Volkswagen with an unidentified man. Was it her husband? The records did not say.
When Bochsler applied to see the federal files in 2019, she was refused. The documents were sealed until 2071 on national security grounds and to protect the extended family. Another historian, Gérard Wettstein, tried again in 2025 and received the same answer. Frustrated by what he saw as absurd secrecy, Wettstein challenged the decision in court—an expensive fight he crowdfunded. Within days, he had raised 18,000 Swiss francs. The pressure worked. The Federal Intelligence Service announced it would grant access, though it offered no timeline and spoke only of "conditions and requirements yet to be defined."
Historians remain skeptical about what the files will actually reveal. Sacha Zala, president of the Swiss Society for History, suspects the real reason for the secrecy may have nothing to do with Mengele himself. By the late 1950s, Israel's Mossad was actively hunting Nazi war criminals. Zala believes Swiss authorities may have been in contact with Israeli intelligence, and that protecting those references—not protecting Mengele's memory—is why the files stayed sealed. But Jakob Tanner, who served on the 1990s Bergier Commission investigating Switzerland's wartime conduct, sees a deeper problem. Switzerland has long been sensitive about its role during World War Two: turning away Jewish refugees at the border while Swiss banks held the assets of families later murdered in concentration camps. The sealed Mengele files fit a pattern of institutional shame.
Tanner thinks it plausible that Mengele was in Switzerland in 1961. After Adolf Eichmann's capture by Mossad in Argentina in 1960, other Nazi fugitives in South America grew nervous. Europe, where they had friends and family, might have seemed safer. Another wanted Nazi, Walter Rauff, had spent time in Germany in 1960 for similar reasons. A historian on the Bergier Commission was allowed to examine some Mengele files briefly in 1999 and concluded it was impossible to prove or disprove his presence in Switzerland. That assessment occupied just a few lines in a 24-volume report. The files were sealed again; the historian died seven years later.
Mengele himself died in Brazil in 1979, buried under a false name. His body was exhumed in 1985, and DNA testing in 1992 finally confirmed his identity. But the mystery of Switzerland lingers. Did he return after 1959? Did Swiss authorities simply not notice him, or did they deliberately look away to avoid the embarrassment of arresting a fugitive on their soil? Wettstein and Bochsler both fear the files will arrive heavily redacted, revealing little. "Maybe we will never get to the real truth," Wettstein told the BBC. "We will never know if he was here or not… but maybe we can have at least a clearer idea." For now, that possibility remains locked behind conditions yet to be defined.
Citações Notáveis
As long as they are closed until 2071, it fuels conspiracy, everyone says 'they must have something to hide.'— Historian Gérard Wettstein
It is a problem for a democratic state that these files are still closed.— Historian Jakob Tanner
A Conversa do Hearth Outra perspectiva sobre a história
Why did Switzerland keep these files sealed for so long? What could possibly be worth hiding?
That's the question everyone's asking. The official reason was national security and family protection. But historians suspect the real sensitivity involves Israeli intelligence—Mossad was hunting Nazis in the late 1950s, and if Swiss authorities were in contact with them, that would explain the secrecy.
So it's not about protecting Mengele's reputation?
Probably not. Mengele's long dead, and his crimes are documented. The secrecy seems more about Switzerland itself—about what it did or didn't do during and after the war.
What did Switzerland do during the war?
That's complicated history. They turned away Jewish refugees at the border. Swiss banks held the money of Jewish families who were later murdered in the camps. There's shame there, institutional shame.
And the Mengele files touch on that somehow?
Maybe indirectly. If Mengele was in Switzerland in 1961, it raises questions about whether authorities knew and did nothing. That would be another embarrassment to add to the list.
Do historians actually think he was there?
Some do. His wife rented an apartment near Zurich airport in 1961, right after an international warrant was issued for his arrest. Police even saw her with an unidentified man. It's circumstantial, but suggestive.
And now the files are finally opening?
Supposedly. But the government's language is vague—"conditions and requirements yet to be defined." Historians fear the documents will arrive so heavily redacted they'll reveal almost nothing.