Answer:
To call for the expulsion of all non-German professors.
Step-by-step explanation:
"The Twelve Theses" was a text published by the German Student Union. These books called for the elimination of all "Jewish aspects" of culture from German literature. Among many other requests, it asked for a ban on publishing works by Jewish authors in Germany, and a ban on German translations of foreign books. It also called for the expulsion of non-German professors.