The Anonymous
Bag On My Head
The Guy Fawkes mask is a stylised depiction of Guy Fawkes, the best-known member of the Gunpowder Plot, an attempt to blow up the House of Lords in London on 5 November 1605. The use of a mask on an effigy has long roots as part of Guy Fawkes Night celebrations.
Illustrator David Lloyd stylised a smiling face with red cheeks, a wide moustache upturned at both ends, and a thin vertical pointed beard; the design came to represent broad protest after it was used as a major plot element in V for Vendetta (1982–1989) and its 2005 film adaptation. After appearing in Web forums it became a well-known symbol for the online hacktivist group Anonymous, used in Project Chanology, the Occupy movement, Anonymous for the Voiceless, Project Zorgo, and other anti-establishment protests around the world. This has led to the popular name Anonymous mask.
https://en.wikipedia.org/wiki/Guy_Fawkes_mask
https://en.wikipedia.org/wiki/Anonymous_(group)
Beware of poseurs like this one.