"If we don't have a peaceful transfer of power in this country, we don't have anything," said U.S. District Judge Timothy Kelly.
Dominic Pezzola, a member of the Proud Boys, did not play a leadership role but was convicted of felonies including obstructing an official proceeding and assaulting police.
Pezzola's attorneys had asked for their client to be sentenced to around five years in prison.
Steven Metcalf, one of Pezzola's attorneys, told the judge that Pezzola was caught in the "heat of the moment."
More than 1,100 people have been arrested on charges related to the Capitol assault.
Persons:
Shannon Stapleton, Trump, Donald Trump's, Ethan Nordean, Stewart Rhodes, Timothy Kelly, Nordean, Nick Smith, Dominic Pezzola, Prosecutors, Mark, Steven Metcalf, Pezzola, Joe Biden, Sarah N, Lynch, Makini Brice, Scott Malone, Grant McCool, Jonathan Oatis, Cynthia Osterman
Organizations:
Trump, U.S, Capitol, U.S . Congress, REUTERS, Rights, U.S . Capitol, Proud Boys, Capitol Police, Prosecutors, Republican, Democratic, Thomson
Locations:
Washington , U.S, Washington