When the Soviets invaded Afghanistan in 1979, the Islamic world began to offer their services into the conflict thru a recruitment office located in Peshawar, Pakistan called the "Maktab al-Khidamat".
The Pakistan ISI would begin funneling military and financial aid to some of the most notorious warlords such as Gulbuddin Hekmatyar, Abdul Rasul Sayyaf and Ahmad Shah Massoud.
The United States intelligence arm, the Central Intelligence Agency, were in the middle of the battle themselves thru the ISI under a covert operation.
Operation Cyclone.
Where over 600 million dollars went to numerous warlords and their organizations, and indirectly into the pockets of the Pakistan office under Osama Bin Laden and Abdullah Azzam.
After the Soviets retreat in 1989, the country spiraled into a civil war between the clans.
The blood feuds began and the Pakistan ISI was fully involved and were influential in making the Taliban the lead in the country for defensive purposes.