The Elite penguin force or EPF is the superior agency that keeps CP safe. It's an intelligence agency, which means that it's against robbers, but not all like Nickel500 or his crew. Nickel is half good and half bad like some of the best robbers in his Crew.
The EPF was established to be a better agency than the PSA (Penguin Secret Agency) and quietly do missions. It used to only be available to people with the Club Penguin: Elite Penguin Force game. When PSA was destroyed in the Popcorn Explosion by Herbert P Bear, it was made the only agency by the Director (Aunt Arctic), and now it has been refurbished, updated and upgraded, with a new Command Room, and better facilities although some very trained Robbers can still break in.