Between the two World Wars, directors like E. W. Emo and Henry Koster - the latter of whom had emigrated from Austria, provided examples of Austrian film comedies. At the same time, Willi Forst and Walter Reisch founded the "Wiener Film" genre. After Austria had become a part of Nazi Germany in 1938, Vienna's Wien-Film production company became an important studio for seemingly non-political productions. In the aftermath of World War II, Austria's film production soon restarted, partially supported by the Allied Forces. Veteran and new directors such as Ernst Marischka, Franz Antel, Geza von Cziffra, Geza von Bolvary and Walter Kolm-Veltee revised the comedy, provincial Heimatfilm, and biopic traditions, and began a new genre of the opulent imperial epic (e.g. Marischka's "Sissi" films and Antel's imperial era musicals) which rivaled Hollywood entertainment at the international box office.