Switzerland will declassify secret files about Josef Mengele, the Nazi doctor known as the "Angel of Death" who conducted brutal experiments on prisoners at Auschwitz. The decision comes after decades of speculation that Mengele spent time in Switzerland following his escape from Europe after World War II.

Mengele, a physician in the SS, performed lethal medical experiments on camp inmates, particularly children and twins, during the Holocaust. He evaded capture after the war and fled, sparking persistent rumors that he found refuge in Switzerland, a country that maintained controversial neutrality and banking secrecy during and after the Nazi era.

Swiss authorities have held classified documents related to Mengele for years. The government's decision to open these files represents a shift toward transparency on a sensitive historical chapter. Historians and Holocaust researchers have long sought access to such records to piece together Mengele's post-war movements and clarify his connection to Switzerland, whether brief or extended.

The disclosure aligns with broader efforts across Europe to reckon with World War II archives. Switzerland has faced scrutiny for its wartime financial ties to Nazi Germany and its banking practices that sheltered looted assets. The country has gradually released previously classified materials related to the Holocaust and Nazi collaboration.

Mengele ultimately escaped to South America, where he lived under assumed names until his death in 1979. The upcoming Swiss file release may provide new details about his European movements and any assistance he received. Historians view this as another step in completing the historical record of one of the Holocaust's most notorious perpetrators and understanding how Nazi fugitives exploited post-war Europe's porous borders and complicit neutral nations.