SA (Sturmabteilung or Storm Troopers):

Also known as "Brown Shirts," they were the Nazi party's main instrument for undermining democracy and facilitating Adolf Hitler's rise to power. The SA was the predominant terrorizing arm of the Nazi party, from 1923 until "The Night of the Long Knives" in 1934. They continued to exist throughout the Third Reich, but were of lesser political significance after 1934.