A Labour Day weekend rally in Ontario's Niagara region by a self-described "Canadian men's nationalist" group is prompting concern about rising anti-immigrant sentiment and recruitment efforts of extremist groups.

Researchers who study extremism have compared Second Sons to white supremacist and neo-Nazi active clubs . Such clubs bring members together for fitness workouts, and some experts say it's related to training for what members believe to be an upcoming race war.

Second Sons leader Jeremy MacKenzie is also the founder of Diagolon, an "extremist militia-like organization," according to the RCMP .

On Aug. 31, Second Sons shared photos and videos on social media showing about 50 people marching, chanting and carrying flags through Queenston Heights Park in Niagara-on-the-La

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