 Complete the following phrase:  During the course of his career he would write or co-write over 30 operetta and musical theatre librettos, many of which were later made into films. With the rise of Nazi Germany and the enactment of the antisemitic Nuremberg Laws in 1935, Schanzer left Berlin and moved to his villa in the Austrian spa town of Bad Ischl. He returned to Vienna in 1936, but following the 