On September 15, 1945, former Prussian Culture Minister Adolf Grimme, a friend of the executed Adam Kuckhoff and himself a former member of the Red Orchestra, filed a complaint against Roeder for perversion of justice in his role as investigating attorney and prosecutor of the case.
A few months later, the U.S. Army began investigating the case of Mildred Harnack, an American citizen[5] and wife of one of the Red Orchestra's leading members.
[note 1] The U.S. Army War Crimes Group began investigating Mildred Harnack's case for denial of due process in February 1946.
[5][note 2] In 1951, the case being pursued in the German legal system was similarly halted by the state's attorney in Lüneburg for lack of reasonable suspicion.
[10] Adolf Grimme, Günther Weisenborn, and particularly Greta Kuckhoff, tried to file a lawsuit against Roeder for "crimes against humanity" for having used torture,[11] but the case was delayed by the state's attorney in Lüneburg until the end of the 1960s, at which point it was closed and dropped.