Authorities have alleged that members of Disrupt J20 were behind inauguration protests that turned violent. Some activists, wearing masks and dressed in black, smashed downtown store windows and burned a limousine, resulting in more than $100,000 in damage, officials say. Six officers were injured, including one who was knocked unconscious when a brick or piece of metal thrown by a protester hit him in the head. Officials allege that the protesters employed “black bloc” tactics, most commonly linked to anarchists.