One of these days I'd like to find out what happened to my half-German stepfather's family, considering that at least as of 1919, his grandmother was living in Nuremberg. Military Intelligence did a report on his father in 1941 and it gives you some idea of the reach of the NSDAP even in Sydney in the 1930s.
https://recordsearch.naa.gov.au/SearchNRetrieve/Interface/ViewImage.aspx?B=7633694