I'm not exactly sure about this - but I think when the CIA was created, it had a lot more power and freedom than it does now. While it was always an Inteligence Agency, it was created under the National Securities Act, when we were all freaking out about communism. It was designed as a way to protect the US, and make the peopel think they're safe. It's basically where the ideas of governments spying, running assasinations, and all that came from. Its powers were extremely strong at first, but became limited over the years. For example, after the JKF assasination, I believe the CIA was no longer allowed to conduct assasinations. So, while it was always an inteligence agency, it used to in reality do a lot more than just gather inteligence.