The Austrian viticulture expert Professor Dr. Fritz Zweigelt (1888-1964) studied natural science in Graz and later habilitated at the Vienna University of Natural Resources and Applied Life Sciences. In 1912 he joined the Klosterneuburg Viticulture Institute (Lower Austria), later becoming director of the institute and holding this position until 1945. He also made himself strong in the fight against direct carriers or hybrids. He is considered a meritorious scientist in the field of vine breeding, but he came under strong criticism after the end of the war in 1945. As a convinced National Socialist, he joined the NSDAP, which was then banned in Austria, as early as 1933 and became known for his inglorious statements and actions. After the war he was classified as a "follower" and not prosecuted.