A few years ago, the government of Uganda tried to pass a law that would criminalize homosexuality and punish even those who simply know gay people. The Oscar-winning documentary filmmaker Roger Ross Williams wanted to learn what was behind this draconian proposal, who was driving it. So he went to Uganda. What he learned there led him back to America’s Heartland, from where, he says, Christian Evangelicals have long been working to alter Uganda’s culture and faith. Williams documents this 21st-century crusade in his new film God Loves Uganda, and we're rebroadcasting our conversation with him about it on Friday.