Task: Question Answering
Input (English): Passage: As the purge claimed the lives of so many prominent Germans, it could hardly be kept secret. At first, its architects seemed split on how to handle the event. Göring instructed police stations to burn "all documents concerning the action of the past two days." Meanwhile, Goebbels tried to prevent newspapers from publishing lists of the dead, but at the same time used a July 2 radio address to describe how Hitler had narrowly prevented Röhm and Schleicher from overthrowing the government and throwing the country into turmoil. Then, on July 13, 1934, Hitler justified the purge in a nationally broadcast speech to the Reichstag:
If anyone reproaches me and asks why I did not resort to the regular courts of justice, then all I can say is this. In this hour I was responsible for the fate of the German people, and thereby I became the supreme judge of the German people. I gave the order to shoot the ringleaders in this treason, and I further gave the order to cauterise down to the raw flesh the ulcers of this poisoning of the wells in our domestic life. Let the nation know that its existence—which depends on its internal order and security—cannot be threatened with impunity by anyone! And let it be known for all time to come that if anyone raises his hand to strike the State, then certain death is his lot.
Concerned with presenting the massacre as legally sanctioned, Hitler had the cabinet approve a measure on July 3 that declared, "The measures taken on June 30, July 1 and 2 to suppress treasonous assaults are legal as acts of self-defence by the State." Reich Justice Minister Franz Gürtner, a conservative who had been Bavarian Justice Minister in the years of the Weimar Republic, demonstrated his loyalty to the new regime by drafting the statute, which added a legal veneer to the purge. Signed into law by Hitler, Gürtner, and Minister of the Interior Wilhelm Frick, the "Law Regarding Measures of State Self-Defence" retroactively legalised the murders committed during the purge. Germany's legal establishment further capitulated to the regime when the country's leading legal scholar, Carl Schmitt, wrote an article defending Hitler's July 13 speech. It was named "The Führer Upholds the Law.". 
Question: What is the last name of the person called the Führer?
Output (English): Hitler.