The Blue Angel The Blue Angel The Blue Angel () is a 1930 German tragicomedic film directed by Josef von Sternberg and starring Emil Jannings, Marlene Dietrich and Kurt Gerron. Written by Carl Zuckmayer, Karl Vollmöller and Robert Liebmann – with uncredited contributions by Sternberg – it is based on Heinrich Mann's 1905 novel "Professor Unrat" ("Professor Garbage") and set in Weimar Germany. "The Blue Angel" presents the tragic transformation of a respectable professor to a cabaret clown and his descent into madness. The film is the first feature-length German full-talkie and brought Dietrich international fame. In addition, it introduced her signature song,
Marlene Dietrich most fascinating and affecting documentary ever made about a great movie star". In 1988, Dietrich recorded spoken introductions to songs for a nostalgia album by Udo Lindenberg. In an interview with the German magazine "" in November 2005, Dietrich's daughter and grandson claim that Dietrich was politically active during these years. She kept in contact with world leaders by telephone, including Ronald Reagan and Mikhail Gorbachev, running up a monthly bill of over US$3,000. In 1989, her appeal to save the Babelsberg studios from closure was broadcast on BBC Radio, and she spoke on television via telephone on the occasion