An item of conventional wisdom in our understanding of the Malayan First Emergency is that the original security organisation, the Malayan Security Service (MSS), was a comprehensive failure, prompting its dissolution and replacement with the Malayan Special Branch. This article challenges that orthodoxy, arguing first that MSS actually produced accurate assessments of Malayan Communist capabilities and intentions prior to 1948 although the actual outbreak of violence did come as a tactical surprise. Second, recently released documents show that the abolition of the MSS arose instead from a protracted turf war over the control of intelligence in Malaya with the Security Service (MI5), particularly in the person of the latter’s director gene...