The entry of the Soviet Union into Afghanistan in December 1979 prompted its Cold War rivals, the United States, Pakistan, Saudi Arabia and China, to support rebels fighting against the Soviet-backed Democratic Republic of Afghanistan. In contrast to the secular and socialist government, which controlled the cities, religiously motivated mujahideen held sway in much of the countryside. Beside Rabbani, Hekmatyar, and Khan, other mujahideen commanders included Jalaluddin Haqqani. The CIA worked closely with Pakistan's Inter-Service Intelligence to funnel foreign support for the mujahideen. The war also attracted Arab volunteers, known as "Afghan Arabs", including Osama bin Laden.