Hermann Oberth
After World War II, he moved across the border to West Germany, to the part of the Harz in Lower Saxony, where he became a furniture dealer. He continued his rocket experiments until, at a rocket demonstration on May 7, 1964 on the Hasselkopf Mountain near Braunlage, an accident occurred which killed three people. This accident led to a ban on civilian rocket research in West Germany, ending the rocket experiments of the Hermann-Oberth-Gesellschaft (Hermann Oberth Society) and the Berthold Seliger Forschungs- und Entwicklungsgesellschaft mbH (Berhold Seliger Research and Development Society).