This is a large file of material provided by A.H. Dickinson, Inspector General of Police, Straits Settlements and Chief Security Officer, Malaya; R.B. Corridon, Assistant Superintendent of Police, Security Service; F.A.S. Caldwell, Police Intelligence Branch; C.W. Dawson, Secretary for Defence; Guy Madoc, Federated Malay States Police Intelligence; Forbes Wallace, Assistant Commissioner of Police, Federated Malay States; T.P.M. Lewis, Education Department, Federated Malay States; J.N. Nicholls, Federated Malay States; H.B.J. Donaldson, State Security Officer, Johore; and historian Yoji Akashi. The file also includes correspondence between Dickinson and Hugh Bryson (circa 150 sheets).