The quick growth happened despite legal problems faced by some prominent People's Rights leaders, and continued even as some of the organization's Facebook groups were removed from the social media platform. The organization has grown by roughly 53% in the past year in large part because of continued anti-public health sentiment, according to the report.

People's Rights started in deep-red Idaho, which remains one of the least-vaccinated states with only about 43% of its population fully vaccinated against COVID-19, according to the U.S. Centers for Disease Control and Prevention. The group now includes activists in 38 states, according to the report.

"I think the report underestimates their overall strength, because they've also built out alliances with a range of groups from the Tea Party to the Proud Boys and anti-vax groups," said Chuck Tanner, IREHR's research director. "In certain places they are able to mobilize at levels that make an impact on policy."