Sturmabteilung (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.

"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.