I just wanted to point to a non-film site that a friend just showed me: spymuseum.com
If you have an interest in all things espionage, this is a great resource. All of the big time stories are there: classic spy cases like Alger Hiss and the Rosenbergs, spy masters such as Soviet Feliks Dzerzhinsky and CIA legend James Jesus Angleton. There are also many more obscure, but no less fascinating stories such as Rudolf Abel, who’s story was a major part of the recent film Bridge of Spies.
Most of the stories involve the cold war Great Game between the Soviets and the West and their various proxies around the world. Fascinating stuff if you like your history with a bit of intrigue.