Richard Ungewitter (author of Die Nacktheit [1906]) is more widely known as the founder of nudism, his reputation having survived Pudor's accusations of plagiarism.
Although Pudor, for example, was overtly anti-Semitic, Karl Toepfer warns that there was no "deep, inherent connection" between Germanic body culture and Nazism (p. 9).
The so-called "father of nudism" was the German Heinrich Pudor (real name Heinrich Scham), who coined the term Nacktkultur ("naked culture") and whose book Nackende Menschen (Naked man [1894]) was probably the first book on nudism.