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The SA (Sturmabteilung) - 'stormtroopers' - were the Nazis' paramilitary wing.
In English they would be referred to as Stormtroopers.
The SA (Sturmabteilung, 'Brownshirts') was the paramilitary wing of the Nazi party (NSDAP).
Gestapo.
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No, the Gestapo was the secret police. The Stormtroopers were called the Sturmabteilung or SA in German.
The leadership of the SA (Sturmabteilung) was purged off.