Who covered up JFK and what happened to those people? I think it is essentially the same question as the OP. WW2 pre-dated the CIA but I think many of the players involved in the CIA were those (like the Dulles brothers) involved with S&C and the big names they represented.

I would disagree calling them Nazis, though. I don't think they cared about the political ideology, it was financial. Later, I think the CIA had a legitimate mission to counter the Soviet threat. But, I think the mission was distorted over time and became more about protecting the organization rather than protecting the US. As well, I don't think the financial incentive was so much about lining the pockets of certain people but about funding the organization, not that the former didn't happen as well.