 It said among other things the temporarily active in Siegen media scientist Karl Prümm and Romani Rose, chairman of the Central Council of German Sinti and Roma.In Hannover moved Gunter Demnig front of the entrance of the bookstore Lehmann at the Heiligerstraße 16 on 4 December 2012 a stumbling block for Kraemer marking the site where the party office of the KPD had been, in which Kraemer had worked as a district secretary.The stone was donated by the VVN-BdA Siegerland-Wittgenstein.