"Anmerkungen zu Hitler" by the German historian Sebastian Hafner (1907-1999) is an analytical commentary on his fiction bestseller “Defying Hitler: A Memoir” (1939), written forty years later (1978). And today — forty years later-this clear and profound study of the phenomenon of the political monster has all the qualities of an absolute "must read". No wonder the historian and political scientist Golo Mann (son of Thomas Mann) called for studying "Anmerkungen zu Hitler" in high school. Understanding how and why "someone", one of the crowd, can become a popular politician and lead the crowd to crime, is of particular value in our time, which gives unlimited technological possibilities for turning personal psychosis into mass psychosis.