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.
Entries linking to sturmabteilung
Brown Shirt n.
generic term for "Nazi, fascist," especially of the thuggish sort, 1934, originally (1922) in reference to the German Sturmabteilung ("Storm Detachment"), the Nazi party militia founded 1921; they were called Brown Shirts in English because of their uniforms.
storm-trooper n.
"member of the Nazi Sturmabteilung," 1933, from storm (v.) + trooper (also see Sturmabteilung). Storm-troops (1917) translates German sturmtruppen, introduced by the German military in World War I.