Concert film "save the children"

HELLO ALL! BELOW IS A LINK TO AN ARTICLE I WROTE ABOUT THE CONCERT DOCUMENTARY "SAVE THE CHILDREN" WHICH FEATURED PERFORMANCES BY THE JACKSON 5, STAPLE SINGERS, ISAAC HAYES AND OTHERS. A CLIP FROM SOUL TRAIN THAT SHOWS CLIPS FROM THE MOVIE IS INCLUDED: http://soultrain.com/2013/09/09/clas...-the-children/

I remember The Supremes Mary Wilson Jean Terrell and Lynda Laurence performing,at The Black Expo,but when the movie came out,The Supremes were not in it,i wonder why.Please stay positive