Reminds me of Daryl Davis.
In 1983, he was playing country western music in a "white" bar in Frederick, Maryland, when a patron came up to him and said it was the first time he had "heard a black man play as well as Jerry Lee Lewis". Davis explained to the man that "Jerry Lee learned to play from black blues and boogie-woogie piano players and he's a friend of mine". The white patron was skeptical and over a drink admitted he was a member of the KKK. The two became friends and eventually the man gave Davis contact information on KKK leaders.
A few years later, Davis decided that he wanted to interview Klan members and write a book on the subject, to answer a "question in my head from the age of 10: 'Why do you hate me when you know nothing about me?' That question had never been answered from my youth".
Davis eventually went on to befriend over twenty members of the KKK, and claims to have been directly responsible for between forty and sixty, and indirectly over two hundred people leaving the Klan.