[@Vocab]I have not, at least, not in full(has seen like one episode).

As for the group, The hand works through his five commanding officers and Division leaders, which are known as the Fingers. They're the ones who interact with Aiden directly, and when they get a job request, the hand and his fingers talk over to see who gets the job, with the hand having the final say in the decision. Each division is split into a number of teams and usually has a specialization(which I know have to think of, since I just thought this up). They'll likely be Info gathering, Assasinations, Open Combat, Sabotage, and Total Demolition.