Final answer:
Law enforcement personnel from the FBI and the U.S. Marshals operate under the Attorney General, whereas the NCIS does not fall under this authority.
Step-by-step explanation:
Law enforcement personnel that operate under the direction of the Attorney General include the Federal Bureau of Investigation (FBI), the U.S. Marshals, among others. The FBI is the principal federal law enforcement agency within the United States, tasked with investigating a wide range of federal crimes and is overseen by the Department of Justice, which is headed by the Attorney General. While other law enforcement bodies such as the National Transportation Safety Board Office of Investigations maintain specific functions, they do not fall under the Attorney General's direction. The Naval Criminal Investigative Service (NCIS), on the other hand, is a federal law enforcement agency that operates under the Department of the Navy and is therefore not directly under the Attorney General's purview.