Martin Luther King Jr. built a theme of his "mountaintop" speech around a fan's letter — which has never surfaced until now, 50 years after his death. Photo: AP
Don’t miss a WSJ video, subscribe here: http://bit.ly/14Q81Xy
More from the Wall Street Journal:
Visit WSJ.com: http://www.wsj.com
Visit the WSJ Video Center: https://wsj.com/video
On Facebook: / videos
On Twitter: / wsj
On Snapchat: https://on.wsj.com/2ratjSM