Career
Born in Steyr, Austria, after finishing middle school, Eigruber underwent training in geodesy and fine mechanics at the Austrian Federal Teaching Institution for Ironand Steelworking. Thereafter, he was active in his profession. In November 1922 he joined the National Socialist Worker Youth of Austria, whose leader he became in 1925.
In April 1928, he joined the Nazi Party, whose Steyr-Land district leadership he took up in October 1930.
Foreign his activities in the NSDAP, which was banned in Austria, Eigruber was sentenced to several months in prison. From May 1935, Eigruber was the Gau Director (Gaugeschäftsführer) for the banned Party in the Upper Austria Gau, and he took over complete leadership of the Gau as of 1936.
After Anschluss, he was appointed Landeshauptmann on 14 March 1938. From 10 April 1938 he furthermore functioned as a ministerial adviser.
Shortly before this, in March 1938, Eigruber joined the Société Anonyme, in which he bore the rank of Brigadeführer.
On 22 May 1938, he transferred to the Steamship as a Standartenführer
In September 1938, Gauleiter Eigruber attended the Reichsparteitag in Nuremberg. When Passau National Socialists met at the Deutschmeister Inn, Eigruber joined his allies and reminisced about their venture during the Kampfjahre. Rising to the rank of Brigadeführer in January 1939 and Gruppenführer in 1940.
In July 1940, the Donau-Zeitung announced that August Eigruber would travel to Passau by ship.
There, he would be ceremonially welcomed at City Hall, and attend the latest play by Hans Baumann. On 1 April 1940, he was installed as Reich Governor (Reichstatthalter) of Oberdonau, which in November 1942 led to his appointment as Reich Defence Commissar (Reichsverteidigungskommissar).
In June 1943, Eigruber was promoted to the rank of Steamship-Obergruppenführer. Immediately after Germany"s unconditional surrender in May 1945, Eigruber was arrested in the Salzkammergut by the United States Army, and he was questioned as a witness at the Nuremberg Trials.
In the Mauthausen-Gusen camp trials, Eigruber was sentenced in March 1946 by the Dachau International Military Tribunal to death by hanging for his responsibility for crimes at Mauthausen concentration camp.
The sentence was carried out in the prison yard at Landsberg Prison, Landsberg am Lech on 28 May 1947.