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Douglas Harper's Etymology Dictionary
Sturmabteilung

1923, from German, literally "storm detachment;" paramilitary force of the Nazi Party, founded 1921, repressed 1934, also know by its initials, S.A.; also see Brown Shirt.

Wikipedia
Sturmabteilung

The Sturmabteilung (SA; ; literally Storm Department) functioned as the original paramilitary wing of the Nazi Party (NSDAP).

It played a significant role in Adolf Hitler's rise to power in the 1920s and 1930s. Their primary purposes were providing protection for Nazi rallies and assemblies, disrupting the meetings of opposing parties, fighting against the paramilitary units of the opposing parties, especially the Red Front Fighters League (Rotfrontkämpferbund) of the Communist Party of Germany (KPD), and intimidating Slavic and Romani citizens, unionists, and Jews – for instance, during the Nazi boycott of Jewish businesses.

The SA have been known in contemporary times as "Brownshirts" (Braunhemden) from the color of their uniform shirts, similar to Benito Mussolini's blackshirts. The SA developed pseudo-military titles for its members. The SA ranks were adopted by several other Nazi Party groups, chief amongst them the Schutzstaffel (SS), which originated as a branch of the SA before being separated. Brown-coloured shirts were chosen as the SA uniform because a large batch of them were cheaply available after World War I, having originally been ordered during the war for colonial troops posted to Germany's former African colonies.

The SA became disempowered after Adolf Hitler ordered the "blood purge" of 1934. This event became known as the Night of the Long Knives (die Nacht der langen Messer). The SA was effectively superseded by the SS, although it was not formally dissolved until after the Third Reich's final capitulation to the Allied powers in 1945.