Allen Dulles and his brother, John Foster Dulles designed the CIA for Clark Clifford, the author of the NSA act of 1947. Allen Dulles had been the top OSS agent in Switzerland during the war, where he met frequently with Nazi officials and monitored US investments in Germany. He held an executive position with Standard Oil. The Dulles brothers were both partners in the Wall Street firm of Sullivan and Cromwell, still the most powerful firm of it's kind. John Foster would go on to be Secretary of State for Eisenhower, while Allen was head of the CIA. Allen Dulles was fired by Kennedy in 1961 after the failed Bay of Pigs invasion in Cuba. Allen Dulles became the lead investigator of the Warren Commission that found Oswald to be the lone gunman.