Berlin in the end of April 1968 in order "to discuss the preparation of actions against Kiesinger and obtain appropriate support" there with the National Council, the supreme body of the National Front. On 9 May she was in West Berlin, for a demonstration of the extra-parliamentary opposition about Kiesinger's Nazi past. A press conference was scheduled for 10 May. On 14 May, Klarsfeld wanted to organize a "Kiesinger-Colloquium" in Paris. The West Department of the Socialist Unity Party of Germany (SED) Central Committee immediately informed Walter Ulbricht, its chairman, of Klarsfeld's plans. Subsequently, the National Council was instructed "to provide any relevant assistance to Mrs Klarsfeld". She was eventually supported by the publication of a brochure with a circulation of 30,000 copies. However, the financial help she wished for was not granted. On 9 May, Klarsfeld, Günter Grass (who had urged Kiesinger in an open letter to resign in 1966), Johannes Agnoli, , Jacob Taubes and Michel Lang (a student from the "Jewish Working Group for Politics") led a panel discussion in front of about 2,000 to 3,000 students in the main lecture theatre of the Technical University of Berlin. Grass was initially booed from the audience before starting his speech. Klarsfeld, who presented Kiesinger as a major threat to Germany promised those present to try to slap him publicly. This was greeted with laughter by part of the audience, including representatives of the Sozialistischer Deutscher Studentenbund (SDS). Grass' thesis that a withdrawal by Kiesinger would be a prerequisite for an effective fight against the far-right NPD, was rejected by Agnoli and Krippendorff. The conference ended with a 3/4 majority urging Kiesinger to resign. In mid-1968, as a witness in a lawsuit, Kiesinger claimed he had not heard about the murder of Jews until 1942 and that it had not been until late 1944, on the strength of foreign reports, that he had first believed any of it. During a CDU party conference in the Berlin Congress Hall, in West Berlin, on 7 November 1968, Klarsfeld mounted the podium, slapped Kiesinger, and shouted "Nazi, Nazi, Nazi". A few days later, during an interview with Der Spiegel she maintained that she had already planned the slap on 9 May 1968. She said that she had wanted to give voice to that part of the German people - especially the youth - who were opposed to a Nazi being the head