NAMBLA

https://en.wikipedia.org/wiki/North_American_Man/Boy_Love_Association

pro-pedophile activism

Founder was David Thorstad, he pushed for the Gay rights movement that later became known as "LGBT" in hopes that pedophila would be later accepted once society lets go of their morals.

https://www.conservapedia.com/David_Thorstad

does not provide any history on him other than that he is american, likely jewish.