Bayreuth Festival and foreign singers, long after they had been banned from all other venues across Germany (including heldentenor Max Lorenz, married to a well-known Jewish woman). Winifred's influence with Hitler was so strong that Hitler even wrote a letter (at her behest) to anti-fascist Italian conductor Arturo Toscanini, begging him to lead the festival. Toscanini refused. From 1933 to 1942, the festival was conducted principally by Karl Elmendorff. It was under the Third Reich that the festival made its first break from tradition, abandoning the deteriorating 19th century sets created by Richard Wagner. Many protested at the changes, including prominent conductors
Bayreuth Festival banned her from administration of the Bayreuth Festival and its assets, which fell eventually to her two sons, Wolfgang and Wieland. During American occupation of the region after World War II, the theatre was used for army recreation and religious services for American soldiers. Only popular concerts and mixed entertainment were allowed: comedy, dancing, acrobatics, and then only "Die Fledermaus" was staged. When the Festival House was handed over to the city of Bayreuth in 1946, it was used for concerts of the Bayreuth Symphony Orchestra and the performances of such operas as "Fidelio", "Tiefland", "Madama Butterfly" and "La traviata".