Vigilantes in uniforms; New Labour Brown Shirts. In the UK, these are jumped up officious people in police-style uniforms but no legal training who harass citizens for "terrorist crimes" such as taking photographs of their local High Street.
"I told the young PCSO that I was fully aware of my rights and I suggested he call for a "proper policeman". The policeman duly arrived and gestured for the PCSOs to sod off." (Paul Giverin in uk.rec.photo.misc)