Dennis Sidorski, 'American Supremacist' Rioter, Charged After Ex-Employee Contacts FBI

A Virginia man allegedly seen wearing a sweatshirt featuring the words "American Supremacist" inside the U.S. Capitol has been charged over the January 6 riot.

Court documents state that Dennis Sidorski, 46, was identified by two former employees from video footage taken in the building, where some Trump supporters violently protested the congressional certification of Joe Biden's presidential election victory.

Sidorski, of Ashburn, was allegedly observed walking through the halls of the Capitol during the riot, according to a sworn affidavit seen by Newsweek.

He was spotted by a "concerned citizen" who came across a screenshot of Sidorski from a video on Twitter and contacted the FBI on January 7, the document states.

Trump supporters storm the Capitol in DC as hundreds enter the building #DC #January6 #January6thDC #DCRally

— Brendan Gutenschwager (@BGOnTheScene) January 6, 2021

The witness further identified Sidorski as the Operations Manager of ADESA Washington, D.C. A video on the company's website features a man of the same name and job title.

Investigators said the man in the company video "bears strong similarities to the likeness and physical characteristics" as the man seen in the Capitol building on January 6.

Sidorski was then located using the open source Virginia Department of Motor Vehicles (DMV) database, which featured a photo investigators said was "consistent" with the two videos, court documents show.

Dennis Sidorski
Investigators said they located Dennis Sidorski through the Virginia Department of Motor Vehicles (DMV) and found a photograph of Sidorski which appeared consistent with the man in the screenshots circulating online. DMV

Another witness who contacted the FBI said that he worked with Sidorski at ADESA from sometime in 2016 until April 2020, according to the affidavit.

A third witness told investigators they had worked for Sidorski approximately ten years ago at the same company in Washington, D.C. and that their family member was still in contact with Sidorski.

Tweet by @vbagate makes it into criminal complaint for Loudoun Co. Va. man accused in #CapitolRiot. Dennis Sidorski worked at DC area auto auction. Former employees turned him in to @FBI Conplaint:

— Lindsay Watts (@LindsayAWatts) January 23, 2021

Sidorski was subsequently charged with four counts related to violent entry into the restricted grounds of the Capitol, CNN reports.

The latest charges join the hundreds made by the DOJ in connection to the storming of the Capitol, amid a nationwide effort to find those involved in the insurrection.

A total of 181 people have been charged in federal court as of Wednesday morning, according to Justice Department announcements and court records, CNN reported.

Although most have been charged with minor crimes, many defendants have been exposed as having troubling histories.

Three additional conspiracy charges have been brought against members of the far-right Oath Keepers militia group and members of the street-fighting Proud Boys organization have also been charged as prosecutors continue to probe possible terrorism tactics used by right-wing extremists.

Thousands of Donald Trump supporters gathered in Washington, D.C. on January 6 to protest the congressional certification of President Joe Biden's victory. Five people died during the attack, including Capitol Police officer Brian Sicknick.

Before the violence erupted, pro-Trump protesters gathered for rally near the White House and Trump addressed the crowd. The then-president repeated his baseless allegations that the 2020 election was stolen from him. He told his supporters that "we will never give up" and that they would have to "fight much harder."

A mob later stormed the U.S. Capitol building to disrupt the joint session of Congress. Federal prosecutors are continuing to charge participants in the Capitol riot.

Newsweek has contacted the U.S. Justice Department for comment.

The #FBI is still seeking information to help identify individuals who actively instigated violence on January 6 in Washington, D.C. Visit to see images from current cases, and if you see someone you recognize, submit a tip at

— FBI (@FBI) January 10, 2021