 The SID had the post of deputy director, which was held by Lim Chye Heng in 1975.The SID shared a similar background to its domestic counterpart, the Internal Security Department (ISD).In the aftermath of 1915 Singapore Mutiny, to collect the political intelligence, espionage, and the surveillance of potential subversives, a political intelligence bureau was established in Singapore under direct command and control of Major General Dudley Howard Ridout, General-Officer-Commanding (GOC) Singapore, which eventually became the Criminal Intelligence Department (Special Branch) in 1919.