Today it has ties to the Agha Khan Foundation and, of course, USAID.
popcouncil.org/about/timeline
popcouncil.org/about/leadership
If you weed through the timeline you see ties to the Ford Foundation, USAID, setting stardards for all sorts of treatments and contraceptive devices worldwide, and with HIV all of a sudden popping up (just coincidence) a focus on HIV research.