Since 2015, right-wing extremists have been involved in 267 plots or attacks, leading to 91 deaths.
The three, members of the Rise Above Movement, had been charged under a federal anti-riot statute with planning and then carrying out assaults at rallies in California in 2017. The judge said the federal statute used to prosecute them was unconstitutional.
In pleading guilty, the authorities said, two of the defendents admitted their actions were not in self-defense.
Victims hope the case will “set a precedent that this white nationalist violence that has been present since this nation’s inception is no longer tolerable.”
The men are accused of participating in violent attacks, as well as using the internet to incite violence ahead of various events.
The charges against members of the Rise Above Movement come weeks after four other members or associates of the group were indicted on riot charges in Virginia.
"General District Judge Robert H. Downer Jr. said Friday that it was clear Harris did not intend to harm the complainant."