One can no longer speak of purely "terrorist" or purely transnational criminal groups, as exemplified by the following:

DOJ News Release (July 26, 2011):

Manhattan U.S. Attorney Announces Arrests in DEA Narco-Terrorism Undercover Operations

One DEA Operation Results in Arrests of Defendants for Agreeing to Acquire $9.5 Million Worth of Surface-to-Air Missiles and Other Weapons for Hizballah

Separate DEA Operation Culminates in Arrest of Heroin and Weapons Trafficker from Kandahar, Afghanistan for Taliban-Related Narco-Terrorism Conspiracy
Note the well-traveled defendants and where they were arrested:

Preet Bharara, the United States Attorney for the Southern District of New York, and Michele M. Leonhart, the Administrator of the United States Drug Enforcement Administration (DEA), announced the unsealing of two indictments resulting from two DEA narco-terrorism undercover operations: first, an indictment against Siavosh Henareh, Bachar Wehbe, and Cetin Aksu for conspiring to provide various forms of support to Hizballah; second, an indictment against Taza Gul Alizai ("Gul") for narco-terrorism conspiracy, narco-terrorism, and heroin importation related to his supplying of 15 kilograms of heroin and six AK-47 assault rifles to a DEA confidential source whom Gul believed represented the Taliban. Henareh and aksu were arrested yesterday in Bucharest, Romania, where they were detained pending extradition to the United States. Wehbe and Gul were arrested yesterday in the Republic of the Maldives, and arrived in the Southern District of New York earlier today.
Of much greater general interest is the recent Executive Order--Blocking Property of Transnational Criminal Organizations (July 25, 2011):

By the authority vested in me as President by the Constitution and the laws of the United States of America, including the International Emergency Economic Powers Act (50 U.S.C. 1701 et seq.) (IEEPA), the National Emergencies Act (50 U.S.C. 1601 et seq.) (NEA), and section 301 of title 3, United States Code,

I, BARACK OBAMA, President of the United States of America, find that the activities of significant transnational criminal organizations, such as those listed in the Annex to this order, have reached such scope and gravity that they threaten the stability of international political and economic systems. Such organizations are becoming increasingly sophisticated and dangerous to the United States; they are increasingly entrenched in the operations of foreign governments and the international financial system, thereby weakening democratic institutions, degrading the rule of law, and undermining economic markets. These organizations facilitate and aggravate violent civil conflicts and increasingly facilitate the activities of other dangerous persons. I therefore determine that significant transnational criminal organizations constitute an unusual and extraordinary threat to the national security, foreign policy, and economy of the United States, and hereby declare a national emergency to deal with that threat.
....
Entities

1. THE BROTHERS’ CIRCLE (f.k.a. FAMILY OF ELEVEN; f.k.a. THE TWENTY)
2. CAMORRA
3. YAKUZA (a.k.a. BORYOKUDAN; a.k.a. GOKUDO)
4. LOS ZETAS
Note that the legal authority cited is Title 50 and not Title 10.

Regards

Mike