More than seventy years after the end of the Second World War, atrocities committed under the National Socialist regime still continue to occupy the courts in Germany. The recent case of Oscar Gröning raised a number of highly relevant legal issues, particularly with regard to the degree of participation in criminal offenses in general, and more specifically, with regard to the possible level of criminal liability of individuals who, as part of a large-scale “killing machinery”, were acting under the command of superiors and, as such, not directly involved in the acts of homicide which were perpetrated. Different theories pertaining to the level of participation are analyzed, and the German Federal Court’s decision in the Gröning case is dealt with in detail.