I think the "unification" of these groups - Muslim and leftist extremists - is one of the biggest things to worry about. It is known that there have been contacts between ETA and the jihadis in Spain (and that ETA was probably involved, at least from a supply and training point of view, in the March 11 bombing) and these groups have a long track record of supporting each other. But I think they haven't quite united their forces yet, although ideologically they seem to find no conflict between authoritarian Islam and authoritarian Marxism, so it's probably only a matter of time.
Ah yes. Reminds me of an Iranian I met at college just after the fall of the Shah. He was a Communist, and couldn't wait to get back to Iran. His "friends" had helped the Mullahs toss the Shah, but he wanted to go home so that he could take part in the REAL revolution which would throw out those Mullahs. No doubt if he went home he's long dead. Guess the Left never learns.
BTW, did they find Stanislava Cocorovska Poletan yet for that huge cocaine bust?
I ran across a rather organized group of (so-called) intellectual-type anarchists over in Vermont about a year ago. I'll have to see if I can hunt the site up. My concerns are the same as yours. They seem to have a symbiotic relationship of sorts, and you are right, it is dangerous.