The top leaders of the Groyper Army, Nick Fuentes and Patrick Casey, have been in a bitter public dispute in the weeks since the riot. Mr. Casey accused Mr. Fuentes of putting followers at risk of arrest by continuing high-profile activities. Mr. Fuentes wrote on Telegram, “It’s not easy but it is important to keep pushing forward now more than ever.”

Among the Proud Boys, a far-right fight club that claims to defend the values of Western civilization, the recriminations were compounded by revelations that Enrique Tarrio, the organization’s leader, once worked as an informant for law enforcement. Despite denials from Mr. Tarrio, the news has thrown the organization’s future into question…

Daryl Johnson, who has studied the Three Percenters and other paramilitary groups, said the current infighting could lead to further hardening and radicalization. “When these groups get disrupted by law enforcement, all it does is scatter the rats,” he said. “It does not get rid of the rodent problem.”