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.
These are the most current B613 agents.
Former B613 agents and command.
These B613 accents were killed while on a misson or taken out by command.
These B613 agents are missing and their location is currently unknown.