Of course, if you want your paperwork throwing around & some selfies taken the "Far Right" are way up there at the top of the list. However if you need Trucks of peace running over people, nail bombs at pop concerts, or just simple knife attacks then i think Al-Qaeda might just have the edge...
Many videos of them breaking windows and doors to break in, disrupting a constitutional certification of a oresident, congress had to flee. The timing obviously seen as an insurrection coup on that day specifically. Also many things stolen and poop smeared across hallways.