Im split between Al Qaeda and FARC. While Al Qaeda still retains a degree of readiness and lethality, it's mainly it's splinter groups that have carried out the recent bombings around the Arab world. And since no other Islamic group has a true "global reach", Im gonna have to go with the Revolutionary Armed Forces of Colombia (FARC), and not because of there horrible activities inside Columbia, but because they control roughly 70% of the worlds cocaine shipments. Since drug related crime is huge throughout the world, I see it the FARC on a much more deadly level then other groups.