18 U.S. Code § 2383.Rebellion or insurrectionWhoever incites, sets on foot, assists, or engages in any rebellion or insurrection against the authority of the United States or the laws thereof, or gives aid or comfort thereto, shall be fined under this title or imprisoned not more than ten years, or both; and shall be incapable of holding any office under the United States.
Might not apply in every circumstance, but certainly many of these incidents would qualify as A rising or rebellion of citizens against their government, usually manifested by acts of violence. Particularly in circumstances like Portland and Seattle where the rebels have essentially established their own government. And it requires only engaging in the acts, not a conspiracy.
That said, it would be easier to pursue things like arson, murder, attempted murder, assault and such. But those crimes seem to appear relevant only to police officers and a teenager in Kenosha. I suppose when the local prosecutors and governance supports violence in the streets, there's not much to do. Except charge such conspirators with Sedition and Insurrection, which isn't what Barr is talking about.
I dunno ...trying to burn down a police station with the officers inside? That might qualify, ya’ think?
Toppling and graffiti statues, demands to ‘defund the police’ in and of itself?
The no-go zones?
There’s lots and lots of fodder here.