>https://www.historyplace.com/worldwar2/triumph/tr-gestapo.htm
But even this was not enough. The Nazis wanted to change people's thinking. And so, just as they had purged their hated political enemies, they began a campaign to purge hated "unGerman" ideas. That effort started in May 1933 with the worst of all crimes against human thought and culture – the burning of books.