A new German online search engine is helping people to discover if their ancestors were members of the Nazi Party. Christian Rainer, from Austria, told the BBC he found the name of his grandfather 'within a few seconds'. 'I found out that he became a member of the Nazi Party around 21st of April 1938, just a few days after the Anschluss,' he said, referring to Hitler's annexation of Austria to Germany. The online tool allows people to search through several million Nazi Party membership cards, known as the 'NSDAP-Mitgliederkartei'. The search tool was set up by the German newspaper, Die Zeit, in cooperation with archives in Germany and the USA. Rainer, who never met his grandfather, was surprised to find that it only took him five days to join the Nazi Party after its legality was established in Austria. 'I always knew that he was close to the Nazis, but I was surprised that it only took him five days,' he said. This search engine is crucial for many individuals wanting to unveil family histories and the legacies tied to the Nazi regime, with millions accessing the tool since its launch in early April.