Part I presents a short discussion of the various forms of terrorism, and critiques and challenges the conventional wisdom about who qualifies as a terrorist and what qualifies as terrorism. English courts certainly viewed the slave trade as being both terrorism and illegal commerce. Part II outlines American doctrines about aiding and abetting liability. They come in two flavors - civil and criminal. In addition, Part II explores aiding and abetting liability in England, and highlights the convergences and divergences from American law. Part III gives a short overview of all-risks commercial and marine insurance contracts as they developed in England and in America. Part IV presents a comprehensive discussion of British and American insurers' roles as aiders and abettors of that nefarious enterprise. The article concludes by encouraging public officials to expand their definitions of terrorism, aiding and abetting. It urges members of the legal community to start monitoring courts' and insurance companies' activities more carefully to ensure that those institutions do not wittingly or unwittingly aid and abet terrorism, regardless of the form in which it might appear