To this day the "german folklore" has hardly worked with biographical narratives of resistance fighters against the Nazis. This thesis is an attempt to comply this omission. The biography of a communist resistance fighter, who is working as a contemporary witness in schools and educational institutions since the eighties, constitutes the heart of the debate. The particular focus is on the former resistance fighters experiences during her work as a contemporary witness. Central questions are how Maria Cäsar came to express her personal life memories in public institutions and why she still tries to appeal her messages in particular to teenagers. Based on numerous interviews with the witness herself and with some of her closest companions and family members, it is attempted to demonstrate how her experiences within these activities affected her construction of identity. An introductory chapter on the current state of research represents particular examples of biographical research on memories concerning the national socialist dictatorship. It is followed by an intensive debate on research methods. The last part of the paper deals with Maria Cäsars biography based on identity-?creating activities of the former resistance fighter after the Second World War. The aim is to portray her current construction of identity.