All the armaments the US supplied (most of which actually came from China) to the Mujahideen was distributed by Pakistani intelligence services - that is true. However, the US knew perfectly well who the Pakistanis were giving these weapons to - it had been longstanding US foreign policy SOP to nurture and support far-right, reactionary Islamism as a counter to middle-eastern nationalism. That's the reason the "big bads" in the middle-east now are people like Osama and not people like Arafat.