Despite being serving the US government so far it doesn't appear that they answer to anyone not even The President of the United States. At present they seem to deal with a large number of covert missions; specifically Torture and Assassinations made to look like suicides. B613 has recently been reestablished via and Executive Order signed into law by President Mellie Grant.
Former B613 agents and command.
These B613 accents were killed while on a mission or taken out by command.