Videos and photos shared to social media show the use of pepper spray, fireworks and other explosive devices.
The man eventually handed himself into police after allegedly threatening people with the gun for around 20 minutes.
"These are often loosely affiliated, individuals or sole actors, really motivated by false narratives and ideologies of hate and the like," Department of Homeland Security Alejandro Mayorkas said.
Daniel Goodwyn's defense attorney told a judge that he cannot wear a mask because he is on the autism spectrum and it is "extraordinarily stressful" for him.
"There are thousands of people in the crowd and some just come up to you and say can I take a picture," Acevedo said.
Police on Saturday ordered the area around the business to be cleared and said that anyone remaining would be arrested.
Officers said a group of around 20 people dressed in Proud Boys attire and carrying sidearms, paintball guns and bats were seen outside a Planned Parenthood.
Photographs show participants wearing "Proud Boys" shirts and holding "PB" signs from their trucks.
Prosecutors allege Rittenhouse traveled to Kenosha, Wisconsin to answer a call for paramilitary groups to protect businesses during a Black Lives Matter protest.
The Department of Justice has now charged current or former members of every branch of the armed services.
A similar incident occurred a night earlier in Boston.
Lawyer John Pierce, who also represented Kyle Rittenhouse, had announced the creation of the National Constitutional Law Union.
"We've been through the wringer. Any other group after January 6th would fall apart." Tarrio said about the Proud Boys.
The Nevada Senate Republican Caucus called for an audit of the vote to censure Secretary of State Barbara Cegavske, after allegations of a far-right activist group's involvement in swaying the censure vote has come to light.
Milo Yiannopoulos, who has a weekly show on the network, claimed the company was laying off all its staff.
People with Chinese surnames donated nearly $85,000 to the far-right group. Experts say that Asian American conservatives may sympathize with the group's aims.
"To be clear: we are not a militia," the group that calls itself "Mamalitia" insisted.
Stephen Cilurso blamed himself for drinking while using his phone and allegedly conceded to detectives that "my mouth is my worst enemy."
The suspect, also known as Rufio Panman, is seeking donations on a fundraising page used by other Proud Boys members.
The pair previously attended violent rallies by the far-right group in their home state before allegedly storming the building in Washington, D.C.
Kelly Meggs, an alleged leader of the Oath Keepers, told someone to warn their friend to be "very very careful" because "this isn't a rally," ahead of the January 6 riot.
The former president is making his own social media network, but far-right supporters say he should join existing platforms instead.
Two more prominent members of the far-right group have been accused of conspiring to attack the building on January 6.
Christopher Worrell is also said to have uploaded videos of him taking part in the insurrection onto Facebook.
Officer Rick Fitzgerald of the Fresno Police Department is accused of taking part in a Proud Boys counterprotest on Sunday.
The banjo player endorsed the right-wing commentator over the weekend, and has since received heavy backlash from fans.
"The Proud Boys are threatening to shut down the water system in the downtown area, which includes government facilities," the email said, according to the AP.
Robert Sanford is one of around 300 people who have been charged for their activity in the January 6 Capitol Hill riots in Washington D.C.
The chairman of the far-right group has spoken with CNN about a number of post-January 6 issues.