Happy MLK! I rewatched King in the Wilderness last night. I recommend it if you haven't seen it. It's the story of Dr. King's final years, post-Civil Rights Act. Gives you a sense of the work left unfinished.
Lots of contemporaries of Dr. King are featured in the doc; some aren't with us anymore and most won't be around much longer. That makes me glad this was captured when it was because those who non-violently fought for civil rights are a precious resource.