A new paper from a group of American neurologists makes the case that Hitler suffered from Parkinson's disease for much of his life, and that some of his most fateful decisions were influenced by the neurological disorder. The article is by Raghav Gupta and colleagues and it appears in World Neurosurgery - a journal with an interesting political history of its own. Gupta et al. note that
The possibility of Hitler suffering from Parkinson's has long been the subject of debate... [a researcher] Lieberman suggested that Hitler suffered from Parkinson's as early as 1933: video evidence depicts that Hitler exhibited progressive motor function deterioration from 1933 to 1945.