Major General Hans Oster (1887–1945), one of the earliest and most determined opponents of Adolf Hitler and Nazism, moving spirit of German resistance from 1938 to 1943, was a first cousin-in-law of Rittmeister () (1888–1976). Walter Jauch was the founder of Jauch & Hübener, who were at the beginning of the Second World War the largest insurance broker in continental Europe. In the Oster Conspiracy Oster planned already in 1938 to assassinate German dictator Adolf Hitler, the leader of Nazi Germany. Oster and his opposition group including Hans von Dohnányi were supported by Jauch & Hübener, today's German branch of Aon Corporation. Walter Jauch's co-founder was arrested 1945 in Hamburg and hanged in late April 1945 without trial, a few days before the end of Nazi Germany.