A likely conduit of funding for the Mujahadeen resistance was the ‘bank’ BCCI founded by Pakistani financier Agha Hasan Abedi.
‘Among the stated goals of its Pakistani founder were to "fight the evil influence of the West," and finance Muslim terrorist organizations.’
http://www.washingtonmonthly.com/features/2004/0409.sirota.html
‘Though the discovery of irregularities led to the shutdown of B.C.C.I.'s banking operations last July (2000), Abedi's $20 billion "bank" is in fact far more complex. It is a vast, stateless, multinational corporation that deploys its own intelligence agency, complete with a paramilitary wing and enforcement units, known collectively as the "black network." It maintains its own diplomatic relations with foreign countries through bank "protocol officers" who use seemingly limitless amounts of cash to pursue Abedi's goals.’
http://www.time.com/time/magazine/article/0,9171,157768,00.html
This page quotes from an article which claims the CIA and the Saudis were connected to the Afghan Mujahadeen via BCCI.
‘During the 1980s, the U.S.secretly provided the mujehedin with more than $2 billion, making the proxy war against the Soviet forces in Afghanistan the biggest U.S. covert operation since World War II. Authorities say because BCCI's Abedi was so well connected to the Pakistani government, the bank played a key role in organizing CIA arms shipments from that country to the Afghan rebels.
... BCCI shareholder Prince Turki worked hand-in-glove with the CIA in funding the proxy war in Afghanistan. Turki, working closely with ISI, distributed more than $ 1 billion in Saudi funds to the mujehedin in the 1980s. ISI officials, with guidance from the CIA, provided day-to-day military advice to the mujehedin.’
http://radiobergen.org/terrorism/binladen/binladen_8.htm