This PDF document is from Charles B. Mickelwaite, theater judge advocate of the war crimes unit, to Col. Mickey Straight and Col. Leon Jaworski of Watergate fame.  It shows the primary reason the concentration camp cases proceeded as they did, and it helps explain the reason that no cases were developed from the Gardelegen Massacre and the Nordhausen process was so limited.  Many people have speculated that so few trials were held for crimes at Nordhausen because the missile work performed there was so secret.  In the end, it was the lack of resources that accounts for that particular factor.