Hiltscher was a very early member of the Nazi Party, having joined in the 1920s. After the “Anschluss” in 1938 he became a judge at the Korneuburg District Court and, one year later, he was promoted to director of the Vienna Regional Court. Judges like him ensured that in controversial or political cases, the ideology of Nazism and Nazi injustice prevailed in court. In 1943 he was drafted into the Wehrmacht (Armed Forces).
Having been dismissed from the judiciary after the end of the war, in 1951 all sanctions against Hiltscher were dropped and he became a judge again. In 1966 he was involved in the creation of various commissions, including one to rule on compensation for German-speakers driven out of Romania, Yugoslavia and Czechoslovakia. In 1969 he was awarded the Grand Decoration of Honour in Gold for services rendered to the Republic of Austria.