Langewand's political career in the Weimar republic began in 1919, when he became vice secretary of the Catholic
Centre Party in the district of Osnabrück. In the same year, he was elected into the
Prussian
Constitutional Assembly. Only one year later, he made way for the more influential trade union secretary
Josef Hagemann. Langewand was elected into the
Landtag of Prussia twice, in 1932 and 1933. After Adolf
Hitler's seizure of power in 1933, which Langewand strongly opposed (he was shouted down by an infuriated pro-Nazi crowd on several occasions), he withdrew from politics. == Political activity after 1945 ==