In folder 5 of container 5645-1-1, PLB.001.  Originally in binder titled "Men, sports, basketball, boxing." See folder level record for more information about binder. 

Photo credited to "UPI/Bettmann Newsphotos."

Label on photo: "#BC-0001 / Cassius Clay (Muhamman Ali) / Black Champions / Miles Educational Film Production / 1986"