Civil rights activist disappears after lending support at the occupation of Wounded Knee in 1973.  FBI documents released in 2013 seem to confirm the murder of Perry "Ray" Robinson, Jr. But what really happened to Ray? And where is he? 

Missing Person Case (namus.gov)

https://en.wikipedia.org/wiki/Ray_Robinson_(activist)

FBI confirms black activist Ray Robinson was killed during 1973 occupation of Wounded Knee - CBS News

Suit seeking info on missing activist filed in NY - StarTribune.com

Solving The Mystery Of A Black Activist's Disappearance | Wyoming Public Media

https://www.lynngehl.com/ally-bill-of-responsibilities.html