The 17-year prison term for organizer Joseph Biggs and 15-year stint for leader Zachary Rehl were the second and third longest sentences handed down yet.
The threat appears to be connected to a far-right conspiracy theory, mainly promoted by supporters of QAnon, that Trump will rise again to power on March 4.
The Department of Homeland Security did not cite any specific plots, but pointed to “a heightened threat environment across the United States” that it believes “will persist” for weeks after Biden's Jan. 20 inauguration.
Small groups of right-wing protesters — some of them carrying rifles — gathered outside heavily fortified statehouses around the country Sunday, outnumbered by National Guard troops and police brought in to prevent a repeat of the violence that erupted at the U.S. Capitol.