Five members of the far-right Oath Keepers group, including the organization’s founder, will go to trial on seditious conspiracy charges this week, the most serious offense to go before a jury in the wake of the deadly riot at the U.S. Capitol last year.

The group is facing several felony counts, most notably seditious conspiracy, a rarely used Civil War-era statute that prosecutors have used to allege the five members planned to forcibly oppose the transfer of power from former President Donald Trump to newly elected President Joe Biden.