The Nazis went about this process in their characteristically ham-fisted fashion ...
"In September 1933, the Nazis created the Reich Chamber of Culture. The Chamber oversaw the production of art, music, film, theater, radio, and writing in Germany. The Nazis sought to shape and control every aspect of German society. They believed that art played a critical role in defining a society's values. In addition, the Nazis believed art could influence a nation's development. Several top leaders became involved in official efforts on art. They sought to identify and attack 'dangerous' artworks as they struggled to define what 'truly German' art looked like." — United States Holocaust Memorial Museum
Comment: The Independent reports: Obviously accidents, incompetence, and even sabotage, happens; it just remains to be seen which is which: