In Göttingen in 1921 he served as the local Chairman of the Deutschvölkischer Schutz- und Trutzbund, the largest, most active, and most influential anti-Semitic federation in Germany.

In particular, the Directory was opposed to the NSFP's advocacy of participation in parliamentary elections, which they viewed as incompatible with the revolutionary impetus of National Socialism.

[7] In September 1925, Haase's Gau joined the National Socialist Working Association, a short-lived group of northern and western German Gaue, organized and led by Gregor Strasser.

[9] Subsequently, Hitler completely repudiated the proposed draft at the Bamberg Conference, a meeting that neither Fobke nor Haase attended,[10] and the Working Association was dissolved shortly thereafter.

Under Haase's leadership, according to the historian Hans-Jürgen Döscher, “the Hanover and Göttingen local groups developed into the most active and largest bases of the National Socialists in Lower Saxony”.

[7] In February 1943, Haase took a position as a personal assistant to the State Secretary and SS-Obergruppenführer Herbert Backe in the Reich Ministry of Food and Agriculture.