In 1939 the so-called 'Entjudungsinstitut' was founded in Eisenach. In church sponsorship, it sought to "research" and eradicate the Jewish influences on theology and the church. The institute shows a perfidious ecclesiastical service to the National Socialist racial policy in a pseudo-scientific guise and marks one of the darkest chapters that the German evangelical responsible theological science wrote during the Nazi era on the initiative of the church. On the basis of existing research results, this volume turns for the first time in an interdisciplinary manner to the 'Entjudungsinstitut', contextualizes the ethnic and anti-Semitic ideology and theology of the institution, compares them with similar pseudoscientific institutes and asks about its impact and impact in Eastern and Western Europe West Germany.