D.C. Attorney General Karl Racine on Tuesday used a law originally written to take on the Ku Klux Klan to file a civil lawsuit against the Proud Boys and Oath Keepers over the Jan. 6 Capitol riot.

“Jan. 6 was a brazen, violent and deadly attack that traumatized this city, this community, and our country,” Racine said in announcing the lawsuit.

He noted that it is the first civil lawsuit by a state or municipal government against the extremist groups for “conspiring to terrorize the District of Columbia, interfering in our country’s peaceful transition of power, and assaulting our men and women in blue.”