
Some Western law enforcement and intelligence agencies have long pointed to what they say are the symbiotic relationships that sometimes exist between terrorist groups and narcotics traffickers, from Al Qaeda in Afghanistan and Hezbollah in the Middle East to the Revolutionary Armed Forces of Colombia, or FARC.
But the move by the United States attorney, Preet Bharara, comes as United States officials have suggested that some members of Islamic extremist groups, including Al Qaeda and some of its affiliates, are more frequently turning to the drug trade — as well as kidnapping and other criminal activities — to help finance their operations.
It is, they say, partly a response to increased pressure on other financial sources, like Islamic charities and private donors.
By merging the units, Terrorism and National Security and International Narcotics Trafficking, Mr. Bharara said he is combining two groups that have developed many of the same skills — working overseas, often using classified information, to build complex cases against sophisticated targets.