Please answer the following question: Generate a question about the following movie plot: May, 1937. Kathie Rauch from Milwaukee, Wisconsin sends a letter to the German Embassy in Washington, D.C. claiming the Hindenburg zeppelin will explode after flying over New York. In the meantime, Luftwaffe Colonel Franz Ritter (George C. Scott) boards with the intention of protecting the Hindenburg as various threats have been made to down the airship, which some see as a symbol of Nazi Germany.Ritter is assisted by a Nazi government official, SS/Gestapo Hauptsturmfuhrer Martin Vogel (Roy Thinnes), who poses as official photographer. However, both operate independently in investigating the background of all passengers and crew on the voyage. Ritter has reason to suspect everyone, even his old friend and former mistress, Countess Ursula von Reugen (Anne Bancroft), who vehemently opposes the Nazi regime.Other prime suspects include card sharks Emilio Pajetta (Burgess Meredith) and Major Napier (Rene Auberjonois), Edward Douglas (Gig Young), a suspicious German-American ad executive, as well as several crew members and even the Hindenburg captains Pruss (Charles Durning) and Lehmann (Richard A. Dysart).As the Hindenburg makes its way to Lakehurst Air Field, events conspire against Ritter and Vogel. They soon suspect the rigger Karl Boerth (William Atherton), a former Hitler Youth leader who has become disillusioned with the Nazis. Ritter attempts to arrest him. Boerth resists. He requests help from Ritter, whose son was killed a year before. Boerth's girlfriend, Freda Halle, was killed while trying to escape arrest as the Hindenburg crossed the Atlantic. Boerth, upon hearing the news of Halle's death, plans to commit suicide by staying aboard the airship as the bomb goes off.Ritter eventually agrees with Boerth to set the bomb to detonate at 7:30 p.m., when the airship should have landed and passengers disembarked. While setting up the bomb (a small C-4 plastic explosive), Boerth drops a knife, which was later revealed to have been stolen from Rigger Ludwig Knorr. Vogel starts to work behind Ritter's back,...
A:
Who did Kathie Rauch send a letter to?