Rockefeller in particular focused his social services on birth control to reduce overpopulation because he saw little value in human life at the bottom of socie

Rockefeller in particular focused his social services on birth control to reduce overpopulation because he saw little value in human life at the bottom of society. That's pretty interesting. Being European, I don't know much about US industrialists and US population policy. I'd like to learn more about this. Do you have books / articles you'd advise on this subject?