The three main intelligence agencies in Pakistan are ISI, Military Intelligence [MI] and the Intelligence Bureau [IB]. Each agency has its own specific responsibilities, but all share the common goal of preserving Paksitan's national security. Since any significant domestic or foreign political activity impinges on national security, there has traditinally been considerable overlap in the activities of these three agencies.
Prior to the imposition of Martial Law in 1958, Military Intelligence reported to the Commander-in-Chief of the Army (C-in-C). When martial Law was promulgated in 1958 all the intelligence agencies fell under the direct control of the President and Chief Martial Law Administrator, and the three intelligence agencies began competing to demonstrate their loyalty to Ayub Khan and his government. The ISI and the MI became extremely active during the l964 presidential election keeping politicians, particularly the East Pakistanis, under surveillance.
Military Intelligence activities include operations in Sindh against Indian intelligence operatives. This organization, implicted in arrests of innocent people, monitors the activities of the leaders of political opposition groups.