Around this time, Böhmcker was a member of the ultra-nationalist and antisemitic terrorist group Organisation Consul, and he was arrested and briefly detained for weapons smuggling in May 1923.

He developed a reputation as a hard-drinking street brawler and acquired the nickname "Latten-Böhmcker" after his weapon of choice, a large wooden board.

As a lawyer, he successfully defended himself and his Party comrades before the courts against political charges, and often intimidated his opponents by filing lawsuits for defamation.

[4] On 1 November 1928, Böhmcker became the leader of the SA in Eutin and, on 1 December, was named Führer of SA-Sturm (platoon) 30 in that city.

Following the purge of the SA known as the Night of the Long Knives, Böhmcker on 10 July 1934 replaced the ousted SA-Gruppenführer Wilhelm Freiherr von Schorlemer [de] to take command as Führer of SA-Gruppe Nordsee, headquartered in Bremen.

An SA-Gruppe was at the time the largest SA formation, and Böhmcker would hold this key post for ten years until his death.

[5] On 11 January 1926, Böhmcker joined the Nazi Party (membership number 27,601) in Ortsgruppe (local group) Eutin.

In November 1931, Böhmcker was the candidate for Minister-president of Oldenburg put forth by the Nazis and their coalition partner the German National People's Party, but he failed to form a government.

One of the so-called early camps, it was used to incarcerate the Nazi's political opponents such as Communists, Social Democrats and trade unionists.

[9] After the passage of the Greater Hamburg Act, the Region of Lübeck was ceded by Oldenburg to Prussia and was incorporated into its Province of Schleswig-Holstein on 1 April 1937.

Böhmcker, losing his position as Regierungspräsident of the Region of Lübeck, was then appointed Regierender Bürgermeister (Governing Mayor) of Bremen by then Reichsstatthalter (Reich Governor) Röver on 16 April 1937.