Herbert Haupt and the other seven "U-boat raiders" were sent to
Washington, D.C., where they faced a
military tribunal. All were found guilty of being
spies, and even though they had not carried out any
sabotage, six–including Haupt–were sentenced to death. Dasch and Burger received long prison sentences, which were commuted to deportation after the war. Haupt,
Edward Kerling, Hermann Neubauer, Werner Thiel, Heinrich Heinck, and
Richard Quirin were all executed on August 8, 1942, in the District of Columbia's
electric chair. It was the largest mass execution by electrocution ever conducted at the
D.C. Jail. Haupt's last undelivered letter to his father read, "Try not to take this too hard. I have brought nothing but grief to all of my friends and relatives who did nothing wrong, my last thoughts will be of Mother." Haupt's parents, Hans and Erna, were both convicted of treason and stripped of their citizenship for harboring and allegedly aiding their son. Four others were convicted in the same trial as Haupt's parents: Haupt's uncle, Walter Wilhelm Froehling, his aunt, Lucille Froehling, and the parents of Wolfgang Wergin, Otto Richard Wergin and Kate Martha Wergin. U.S. District Judge
William Joseph Campbell sentenced Hans Haupt, Walter, and Otto to death, and Erna, Lucille, and Kate to 25 years in prison each. Campbell won praise around the country for the severity of the sentences. On appeal, however, all six defendants had their convictions reversed on several technicalities, mainly errors by the FBI when they took their confession and the refusal of the court to grant separate trials to the defendants. Walter and Otto later pleaded guilty to
misprision of treason and each received five-year sentences. Hans Haupt was retried, found guilty of treason once more, but received a life sentence. Charges were dropped against Lucille and Kate, albeit Erna Haupt was held until the war ended and deported in 1948. In 1957, Hans Haupt was granted clemency by President
Dwight D. Eisenhower and deported to Germany on the condition that he never return to the United States. == Modern relevance ==