Answer
Frank Ramsey was a member of the Cambridge Apostles, an intellectual secret society. The Apostles were founded in 1820 and are a society for undergraduates and graduates of Cambridge University. The society is open to members of all academic disciplines and is known for its intellectual and political discussions. The Apostles have been associated with a number of notable figures, including Bertrand Russell, G. E. Moore, and John Maynard Keynes.