Make it a capital offense.
I would vote yes for any domestic terrorist wearing a hard, full face mask, and clearly in the "antifa" or "anti-kkk" uniform and a deadly weapon found, shoot them between the eyes.
AntiFa thugs love to wear clothes and masks and pretending they are killing on behalf of the opposition.
If violence is the only effective weapon against domestic terrorism with any label, punishment must be immediate, significant and evenly applied. Make it a shoot on sight offense.