As I understand it, if it wasn't for Rutherford changing his support for Hitler ( See the declaration of facts, printed in the 1934 yearbook) Here is a tit bit :-
" Instead of being against the principals advocated by the government of Germany, we stand squarely for such principals"
However when Hitler wanted to confiscate religious property, Rutherford went to "WAR" ( With his pen, and the safety of living in America) against Hitler. This and the fact he had members refusing to " Heil Hitler" nor join the army, and other stupid rules is why Hitler had J. Ws sent to concentration camps.
So if any compensation is due, the claim should be made against the W.T by the relatives of those that perished, due to Rutherfords irresponsible behavior, to his faithful German followers. ( No witness went to a concentration camp due to following God, it was sadly for following a false organisation)
Fortunatly claims against the W.T for ruining life's are now happening with Child abuse claims.