Nazi war criminal Josef Mengele never regretted his crimes and died convinced of the superiority of the Aryan race, according to documents obtained by a local newspaper in Brazil, where he lived for years in hiding. The daily "Folha de São Paulo" obtained 85 documents, some handwritten by Mengele, from the files of the Brazilian federal police which investigated Mengele after his death in 1979. They reflect the racist convictions of the 'Angel of Death' of the Auschwitz extermination camp where he performed cruel medical 'experiments' on mostly Jewish inmates. In a November 1972 letter Mengele said he hoped that racial mixing in Europe was confined to 'neighboring countries' and that the population of northern European nations 'does not decrease'. Mengele also praised the apartheid regime of South Africa. Apartheid was an "effective and unique way to prevent racial mixing", he wrote. Mengele escaped to Argentina in 1949 and later moved to Paraguay and Brazil, where he died in an accident in 1979.