Nadeem Khan/Agence France-Presse — Getty Images Lt. Gen. Hamid Gul, center, the former head of Pakistan’s Inter-Services Intelligence, was arrested during a 2007 demonstration.

“Americans fighting the war in Afghanistan have long harbored strong suspicions that Pakistan’s military spy service has guided the Afghan insurgency with a hidden hand, even as Pakistan receives more than $1 billion a year from Washington for its help combating the militants, according to a trove of secret military field reports made public Sunday.

The reports suggest that the Pakistani military has acted as both ally and enemy, as its spy agency runs what American officials have long suspected is a double game — appeasing certain American demands for cooperation while angling to exert influence in Afghanistan through many of the same insurgent networks that the Americans are fighting to eliminate.

Lt. Gen. Hamid Gul ran the ISI from 1987 to 1989, a time when Pakistani spies and the C.I.A. joined forces to run guns and money to Afghan militias who were battling Soviet troops in Afghanistan. After the fighting stopped, he maintained his contacts with the former mujahedeen, who would eventually transform themselves into the Taliban.”

http://www.nytimes.com/2010/07/26/world/asia/26isi.html?_r=1