Trial against employees of the Gestapoleitstelle (Central Office), Berlin; Results of investigation against Bernhard Baatz, Joachim Deumling, Harro Thomsen, Ferdinand Betz, Ulrich Breitenfeld and Heinz Gruner, members of the "Polish" Referat IV D 2 of the RSHA, accused of complicity in murder of 240 Polish workers in the years 1940 - 1945, 1968