Explanation: The term 'stormtrooper' is often associated with the Nazis nowadays. In fact, the association does come from the name of the SA, the Nazi street thugs who helped Hitler's rise to power.
... but they themselves took the term from the trench assault groups of WW1 Germany, veterans of whom were involved both for and against the Nazis, including in Nazi-opposed groups of the Social Democrats and the Communists. Someone who was part of the "Sturmtruppen" was just a volunteer specialist for close-combat in trench assaults - perhaps a little mad, but not a title which presumed any particular ideology. One imagines that at least a few couldn't help but see the SA taking brawling with civilians as 'stormtrooper' behavior as little more than children playing at war, especially since many of the SA were too young to have participated in WW1.