What is Brownshirts?
1.
Originally used to describe the original members of the Nazi Party who would wear brown uniforms to meetings and events before Hitler came to power.
Now used as a derogatory term for police, FBI or other law enforcement agents or anyone in authority.
Hide the stash man here come the brownshirts.
See
2.
Employees of the Tax Credits Office of Her Majesty's Revenue & Customs (HMRC). Derived both from their role as enforcers for
'I don't believe it, love - the Brownshirts have just phoned demanding we pay all last years Tax Credits back or they'll take us to court'
See