Switzerland has released a 200-page dossier on Josef Mengele, a notorious Nazi war criminal known as the "Angel of Death" for conducting inhumane medical experiments on prisoners at the Auschwitz concentration camp during World War II. The dossier, published by Switzerland’s federal intelligence service, includes information suggesting that Mengele may have returned to Switzerland after escaping Germany or may have planned to enter the country using a false identity. The German news agency dpa reported that the documents, which have been kept confidential for decades, now offer new insights into the possible movements of Mengele after the war. Mengele worked at Auschwitz, which was located in Nazi-occupied Poland, where approximately 1.1 million people were killed—about 1 million of them Jews. He conducted brutal medical experiments on prisoners, including children, under the pretense of scientific research. After the war, Mengele fled Europe using a Red Cross travel document under a false name. He lived in hiding for years in Latin America while being pursued internationally for his crimes. Mengele died in 1979 after drowning off the coast of São Paulo state in Brazil. Historians had long sought access to the files to determine whether Mengele spent time in Switzerland while being hunted as a war criminal, without Swiss authorities catching him. Swiss authorities had argued that the documents should remain sealed until 2071, citing security concerns and the need to protect individuals named in them. However, historian Gérard Wettstein successfully challenged these restrictions before the Federal Administrative Court, leading to the online publication of the dossier. Some parts of the documents have been redacted to protect sources and the personal data of third parties, according to authorities. The dossier was compiled by the police service of the federal prosecutor’s office, a predecessor of Switzerland’s federal intelligence services, and transferred to the Federal Archives in 2001. The release of the dossier marks a significant step in the ongoing historical investigation into Mengele’s post-war activities and the extent of his possible presence in Switzerland.