Joseph Biggs, a onetime lieutenant within the Proud Boys, was sentenced on Thursday to 17 years in jail after his conviction on fees of seditious conspiracy for plotting with a gang of pro-Trump followers to assault the Capitol and disrupt the peaceable switch of presidential energy on Jan. 6, 2021.

Mr. Biggs’s sentence was one of many stiffest penalties issued to date in additional than 1,100 prison instances stemming from the Capitol assault and amongst solely a handful to have been legally labeled an act of terrorism. It was simply over half of the 33 years the federal government had requested and simply shy of the 18-year term given in May to Stewart Rhodes, the chief of one other far-right group, the Oath Keepers militia, who was additionally discovered responsible of sedition.

The sentence, handed down by Judge Timothy J. Kelly in Federal District Court in Washington, kicked off a collection of hearings scheduled for this week and subsequent at which punishment can be meted out in opposition to the previous chairman of the Proud Boys, Enrique Tarrio, and three different members of the group who have been convicted of sedition and different critical crimes at a landmark conspiracy trial this spring.

One of Mr. Biggs’s co-defendants, Zachary Rehl, was sentenced to fifteen years in jail in entrance of Judge Kelly on Thursday afternoon.

The Proud Boys — who had been fighting on the streets since 2017 for a spread of far-right causes — turned a central focus of the F.B.I.’s investigation into Jan. 6 within days of the Capitol attack.

Aside from Mr. Biggs and his co-defendants within the sedition case — Mr. Tarrio, Mr. Rehl, Ethan Nordean and Dominic Pezzola — greater than 20 different members of the group from chapters starting from New York to Hawaii have been in the end charged in separate indictments.

The Justice Department’s prosecutions of the Proud Boys all however decapitated the group’s nationwide management, which was formally disbanded after the Capitol assault, and largely put an finish to its involvement in large-scale — usually violent — pro-Trump rallies in cities throughout the nation.

But as arrests started after Jan. 6, Mr. Tarrio and his circle of lieutenants began an effort to have their followers change into concerned in right-wing politics in several methods. For some, that meant operating for native places of work or positions in county Republican organizations. For others, it meant participating in smaller-scale protests at school boards or in opposition to L.G.B.T.Q. occasions.

For Mr. Biggs, the sentence successfully ended an uncommon profession that included a stint as a fight soldier, a job as a roving correspondent for the conspiracy principle web site Infowars and a management position within the Proud Boys at a second when the far-right group was thrust from the fringes of nationwide politics and into the middle of the 2020 election for his or her backing of President Donald J. Trump.

Mr. Biggs, certainly one of Mr. Tarrio’s closest confidants, helped run the Proud Boys when Mr. Trump famously referred to as out the group throughout a presidential debate in opposition to Joseph R. Biden Jr., telling its members to “stand back and stand by.”

A lesser identified determine, Mr. Rehl — the son and grandson of cops in Philadelphia — ran that metropolis’s chapter of the Proud Boys. He served as what prosecutors referred to as a “managing supervisor” of the conspiracy to disrupt the certification of Mr. Trump’s defeat that was going down contained in the Capitol on Jan. 6.

Mr. Rehl marched with Mr. Biggs that day on the head of a crowd of almost 200 Proud Boys from the Washington Monument to the Capitol and in the end shot a canister of chemical spray at officers defending the constructing. During the trial, he additionally lied in regards to the assault, saying he had by no means assaulted anybody, Judge Kelly discovered.

Racked by sobs, Mr. Rehl apologized to his family and friends — and even the prosecution workforce — telling Judge Kelly he believed the “lies about the election” unfold by politicians.

“I’m done peddling lies for other people who don’t care about me,” he mentioned.

Mr. Biggs additionally wept when he addressed the court docket, saying that he had turned to ingesting — a favourite Proud Boy pastime — after getting back from fight abroad and that the one group he needed to be affiliated with as of late is “my daughter’s P.T.A.”

“I know that I messed up that day,” he mentioned, “but I’m not a terrorist.”

Judge Kelly in flip advised Mr. Biggs that the assault on the Capitol, which he had helped to instigate, was a “national disgrace.”

“What happened on Jan. 6 harmed an important American custom,” Judge Kelly mentioned. “That day broke our tradition of peacefully transferring power, which is among the most precious things we had as Americans. Notice I said ‘had’ — we don’t have it anymore.”

The Proud Boys’ sedition trial, which lasted greater than three months, was some of the vital prison proceedings to have emerged from the Capitol assault. Prosecutors portrayed the group below the command of Mr. Biggs and Mr. Tarrio as a few of the most violent folks within the huge pro-Trump mob that stormed the constructing, with dozens of its members taking part in decisive roles in breaching barricades and assaulting the police.

In court docket papers filed this month, prosecutors described Mr. Biggs as “a vocal leader” of the Proud Boys and an “influential proponent of the group’s shift toward political violence,” noting that inside days of Mr. Trump’s election loss he had declared that the nation may face “civil war.”

Shortly after Mr. Trump posted a message on Twitter, summoning his followers to what he predicted can be a “wild” protest in Washington on Jan. 6, Mr. Biggs wrote to Mr. Tarrio, encouraging him to “get radical and get real men” to reply Mr. Trump’s name to motion.

On Jan. 6 itself, Mr. Biggs took half in an episode outside the Capitol that was widely seen as a tipping point in the riot. He had a non-public dialog with a person within the crowd, Ryan Samsel, after which Mr. Samsel approached a barricade and confronted the police, ensuing within the first breach of the Capitol’s safety perimeter.

After serving eight years within the Army, some as a noncommissioned officer in fight excursions of Iraq, Mr. Biggs “appreciated the tactical advantage that his force had that day, and he understood the significance of his actions against his own government,” prosecutors mentioned.

Moreover, they famous, Mr. Biggs recorded a podcast after the riot by which he declared that the assault on the Capitol was “a warning shot to the government.”

Mr. Biggs’s contacts on the planet of right-wing politics have been by no means restricted solely to the Proud Boys. Like Mr. Tarrio, he has lengthy had ties to Roger J. Stone Jr., certainly one of Mr. Trump’s political advisers. He has additionally been concerned on the edges of far-right disinformation campaigns just like the Pizzagate conspiracy principle, which falsely held that prime Democrats like Hillary Clinton ran a toddler intercourse trafficking operation from the basement of a Washington pizzeria.

While working at Infowars for its proprietor, the conspiracy theorist Alex Jones, Mr. Biggs usually coated the far-right militia motion. In 2014, for instance, he adopted members of the Oath Keepers to Ferguson, Mo., because the group deployed — in its personal phrases — to guard native companies in opposition to unrest that stemmed from a failure to deliver fees in opposition to a neighborhood police officer who had killed a Black man, Michael Brown.

During the sedition trial, prosecutors performed a quick video from Jan. 6 by which Mr. Biggs could possibly be heard saying that he was making an attempt to get in contact with Mr. Jones and needed to fulfill up with him that day. The two males apparently by no means did meet on the Capitol. Mr. Jones, who helped lead a crowd from Mr. Trump’s speech close to the White House to the Capitol grounds, attracted serious scrutiny from investigators however was in the end not charged within the inquiry.

As for Mr. Rehl, Erik Kenerson, a prosecutor, advised Judge Kelly that he had lied not solely when he took the stand in the course of the trial, however has additionally continued mendacity in regards to the continuing.

Mr. Rehl, he mentioned, carried out a number of interviews from jail, “claiming this court caved to political pressure in declining to dismiss the case.”

Judge Kelly’s choice to impose what is called a terrorism enhancement on each males’s sentences was some of the consequential he made on Thursday. The measure will be utilized if prosecutors can present {that a} defendant’s actions have been undertaken in an effort to affect “the conduct of government by intimidation and coercion.”

But as a result of Mr. Biggs particularly didn’t have interaction in any violence in opposition to folks, the terrorism enhancement emerged from a cost by which he was discovered responsible of damaging a government-owned fence in a means that allowed different rioters to surge ahead.

While Judge Kelly mentioned the supply was technically relevant, he was much less sure — given what Mr. Biggs had really performed — that it slot in a extra colloquial sense.

He famous that he had reviewed a number of instances involving terrorism, most regarding conditions the place defendants “were training to fight American troops or planning an act like blowing up a large building.” And he expressed skepticism that the Proud Boys had engaged in that type of habits on Jan. 6.

Norm Pattis, a lawyer representing each Mr. Biggs and Mr. Rehl, agreed, saying that in most terrorism instances the defendants stand accused of actions like taking hostages or creating organic weapons.

“No serious person in this room will argue that the fence was destroyed with the intent of influencing government,” Mr. Pattis mentioned. “It was a means to an end.”

But Jason McCullough, the lead prosecutor within the case, advised Judge Kelly that whereas the crimes dedicated by the Proud Boys that day didn’t “involve mass casualties,” they did contain an assault on Congress — one, he added, that “pushed us to the edge of a constitutional crisis.”

“There’s a reason why we will hold our collective breaths as we approach further elections,” Mr. McCullough mentioned. “We never gave it a second thought before Jan. 6 — none of us.”