ISI, Pakistan
Established in 1948, Pakistan’s Directorate for Inter-Services Intelligence (ISI) is one of the most notorious secret service agencies in the world. Officially, the ISI is responsible for providing security intelligence assessment to the government of Pakistan; however, it is known to be involved in fomenting trouble in India. Currently headed by Zaheer ul-Islam, the ISI is known to command immense power in the Pakistani establishment.