It was us!!!
I have always been sickened by the fact that anarchists have this history of fierce martial struggle, but are today represented by the kind of riff-raff that constitutes the mainstream “anarchist movement.”
A few years ago I did an academic paper tracing the history of modern terrorism to the classical anarchist concept of “propaganda by the deed” and explained how 20th century terrorism evolved into Fourth Generation Warfare. I created a page for it, in case anyone is interested in reading a long, dry academic treatise: