They would, not only for a right price, I guess they fear the terrorists.
A terrorist organization is more powerful than any kind of Mafia all over the world(even if all of them would join to fight against the terrorists).
I think ONE terrorist group(and only one) could blow up all the gangsters together...

Al Qaeda has more sofisticated weapons and techniques than the Cosa Nostra, the Red Mafia, the Yakuzas, the Chinese triads, or whoever all togheter...