Unlawful assembly while wearing a mask or other disguise is a criminal offence in Canada, under section 66(2) of the Criminal Code of Canada.
Punishment for unlawful assembly
66 (1) Every one who is a member of an unlawful assembly is guilty of an offence punishable on summary conviction.
Concealment of identity
(2) Every person who commits an offence under subsection (1) while wearing a mask or other disguise to conceal their identity without lawful excuse is guilty of
(a) an indictable offence and liable to imprisonment for a term not exceeding five years; or
(b) an offence punishable on summary conviction.
R.S., 1985, c. C-46, s. 66; 2013, c. 15, s. 3.
Why is it illegal to wear a mask in an unlawful assembly?
Otherwise law-abiding citizens often become violent while wearing a mask.
In any violence done by a mask-wearer, the human is not considered responsible; everyone understands the crime was committed by the mask itself.
https://aeon.co/essays/how-masks-explain-the-psychology-behind-online-harassment
On August 20, 2017, Blackbloc and Antifa members assembled in Quebec City. They belligerently confronted Quebec French people and
Some Blackbloc and Antifa members even brutally assaulted an older Quebec Frenchman on the head in Quebec while he carried an old Quebec patriote flag on August 20, 2017.
P flag https://en.wikipedia.org/wiki/Patriote_flag
The Patriote flag was used by the Patriote movement in Lower Canada (present-day Quebec) between 1832 and 1838.
Some theories about its origins claim that the colour green was adopted to represent the Irish of Lower Canada, the colour white for the “French Canadians,” and red the English of the territory. Some also say that the tricolour style was inspired by the French tricolour, symbol of the French Revolution that inspired the Patriotes.[citation needed] It became the national flag of the Republic of Lower Canada at the Declaration of Independence of Lower Canada in 1838. Currently, it is used by contemporary Quebec independence supporters as a symbol of their movement and ideal. It is often seen in crowds at Quebec National Day concerts and gatherings and was featured at the voting day assembly of YES supporters of the 1995 Quebec referendum on independence.
https://en.wikipedia.org/wiki/Patriote_movement
Why should a #Quebec man exercising political speech be assaulted by masked criminals?