who was really mr. charrington?

Mr. Charrington appears to be a kind old man interested in history and the past, but later reveals himself to be a member of the Thought Police. Mr. Charrington leads Winston and Julia into his trap, and observes their action from the hidden telescreen in the room above the shop. As he is being arrested, Winston notices that Mr. Charrington looks entirely different, and has clearly been working under disguise for quite some time.