This was the beginning of the modern Austrian party Social Democratic Party of Austria. On 26 September 1928 the Lower Austrian State Government endowed Hainfeld with town privileges. After World War II Hainfeld was the second most destroyed Austrian city behind Wiener Neustadt and part of the Soviet occupation zone in Allied-occupied Austria.
This event signaled the beginning of the contemporary Austrian Social Democratic Party of Austria. On September 26, 1928, the Lower Austrian State Government granted Hainfeld municipal rights. Following World War II, Hainfeld was severely affected and became part of the Soviet-controlled zone in post-war Allied-occupied Austria.