Look up Mattachine Society on Wikipedia. They started this movement back in the fifties.
You will notice Harry Hay is mentioned in the Wikipedia article—he was a promoter of pedophilia. I remember this from a television program that I saw once.
NAMBLA was peopled by people who were in positions of respect such as one of the Catholic priests who molested boys. All of these people who started the Mattachine Society had positions of stature in society. What do you expect all of the movements both good and bad are started by the most intelligent. Unfortunately having a high intelligence does not make a person a good human being.
If you want to read a really good book on what happened in the Catholic Church read “Goodbye, Good Men” by Michael S. Rose. He details how the homosexuals infiltrated the Catholic seminaries which brought about the pedophile scandals in the Catholic Church. You will notice that they use tactics similar to communists—by infiltration and deception. Try looking up this book on Amazon.com. I am sure they have it and it is copywriten in 2002 so it should be quite reasonable in price.
The epidemiology of venereal disease gathered in the Bay Area of San Fran proved that most of the male queer population was spreading their diseases to young boys. We tracked their diseases and the strains of each infectious agent to thousands of young boys. It was disgusting and virtually everyone of the adult queers got away with it.