You're still wrong. Here are 2 uses.
brown shirt (plural brown shirts)
1. Alternative form of Brownshirt
2. A worker whose role is identified by a uniform with a brown or khaki shirt.
> We really could use a brown shirt in the Park. 2007, Dana Stabenow, A Deeper Sleep, page 36
https://en.wiktionary.org/wiki/brown_shirt
digital brownshirt (plural digital brownshirts)
1. (slang, US, derogatory) A right-wing blogger.
> "They paid actors to make make phony video press releases and paid cash to some reporters who were willing to take it in return for positive stories. And every day they unleash squadrons of digital brownshirts to harass and hector any journalist who is critical of the President." Al Gore (October 2005), “Al Gore Addresses We Media”