Documents revealing how infamous Nazi doctor Josef Mengele, known as the “Angel of Death,” led an open post-war life in Argentina were found among a massive trove of evidence released and declassified earlier this year by President Javier Milei. Mengele was notorious for his role as a commander in Auschwitz, where he conducted brutal medical experiments on prisoners, especially twins, under the guise of scientific research. Eyewitnesses — including some contained in the declassified Argentine files — describe his extremely cold-blooded and macabre, sadistic nature, including torturing and testing on twins in front of one another after sending their parents...