Joining the Nazi Party in 1923, he founded and led an () in
Peine, a suburb of
Hanover. In the fall of 1925, Kerrl became a member of the
National Socialist Working Association, a short-lived group of north and northwest German , organized and led by
Gregor Strasser, which unsuccessfully sought to amend the
Party program. It was dissolved in 1926 following the
Bamberg Conference. An associate of
Bernhard Rust, the local , in 1928 Kerrl became the of
Peine District. Also elected to the of Prussia in 1928, he served as head of the Nazi faction and, on 24 May 1932 after the Nazis won the largest number of seats in the April election, he became President of the assembly. He remained in this position until the was finally dissolved on 14 October 1933, in the wake of the Nazi subordination of the German States to the Reich government. After the Nazi seizure of power, Kerrl was appointed Reich Commissioner to the
Prussian Ministry of Justice on 23 March 1933 and on 21 April was made Minister of Justice, serving until June 1934. In this position, Kerrl placed a ban on Jewish notaries preparing official documents and banned Jewish lawyers from practicing in Prussia. In September 1933 he was made a member of the
Prussian State Council. He also was named to the
Academy for German Law and sat on its (). Kerrl was elected to the for electoral constituency 16,
South Hanover-Braunschweig, in November 1933. When the Reichstag convened on 12 December, he was named First Deputy President to President
Hermann Göring and would serve in this capacity until his death. On 17 June 1934, Kerrl entered the national Reich cabinet as a
without Portfolio. ==Minister of Ecclesiastical Affairs==