Wikipedia gives plenty on Adolf Heusinger’s involvement in the Nazi party and millitary.

Here’s a link for Hallstein.

But perhaps the most shocking thing of all about this speech is that Hallstein stated one of the most important laws to be introduced in the annexed countries was the “Law for the Protection of the German Blood, and the German Honour.” In other words, he advocated the imposition of the Nuremberg Race Laws as a top priority in “Greater Germany.” These laws excluded German Jews from Reich citizenship and prohibited them from marrying, or even having sexual relations, with persons of German or related blood.