The Proud Boys have been declared a terrorist organization by the Canadian government.
This was specifically based on their role in organizing and planning for violence at at the Washington DC insurrection.
No matter what your feelings are about the Canadian government, that isn't something they'd do lightly.
While the prod boys official line "we just show up fight anti-fascists" is belied by their actions like "planning and participation in an attempt to violently overthrow the us government"
edit: Here's a reference for the claim WRT being declared an actual terrorist org https://www.usatoday.com/story/news/world/2021/02/03/canada-...