Recently Stewart Rhodes was arrested and charged with seditious conspiracy. In plain English that means he was part of a plot to overthrow the United States Government. The charge is similar to being charged with being a traitor.
Rhodes is a founder and leader of the Oath Keepers, one of the organizations that was active in the invasion of the Capitol on January 6. His charge is far more serious and carries a far greater penalty than the charges we have heard so far. Trespassing and disorderly conduct can be crimes but are not nearly as serious as seditious conspiracy.
I suspect this is part of a strategy by Merrick Garland and the Department of Justice. As I recall about 70 have pleaded guilty as a result of plea bargains. No doubt part of their plea bargains is an agreement to cooperated with the DOJ and to testify for the DOJ. No doubt DOJ lawyers were aware of the more serious charge early on. They were also aware it is difficult to prove because they must present evidence to show a number of people were planning the overthrow of the Government before the events of January 6. And one reason for the plea bargains has been to build that evidence. The news reports there are some members of the Oath Keepers who are prepared to testify against Rhodes. That has to be an important part of the DOJ case.
10 others have also been charged with seditious conspiracy but I have not seen their names.
The below link is to a good article that gives laymen (like me) some insight into what is really going on.