By October 1938 , SD agents were organizing the '' Selbstschutz '' in Poland . Ethnic Germans with Polish citizenship were trained in the Third Reich in various sabotage methods and guerilla tactics . Even before the war , '' Selbstschutz '' activists from Poland helped to organize lists of Poles who later were to be arrested or executed in Operation Tannenberg
Operation Tannenberg
Operation Tannenberg
Selbstschutz