Having seen glimpses of the original German movie, I was overjoyed when SBS in Australia put forward this documentary: "The Blue Angel: Birth of A Legend".
"The Blue Angel is based on Professor Unrat (literally Professor Garbage), a 1905 novel by German novelist Heinrich Mann [1871-1950]. The novel was adapted for the movie, titled 'Der blaue Engel', by German screenwriters Carl Zuckmayer, Karl Vollmöller, and Robert Liebmann, along with Austrian-American film-maker Josef von Sternberg (who also directed the movie). Both the novel and the movie were banned in Nazi Germany in 1933 as being 'contrary to the German spirit.' (Source: Blue Angel FAQ @ IMDb)
* The Blue Angel from wikipedia
* The Blue Angel from IMDb
* Marlene Dietrich from wikipedia