Question: Who was the chair of a commission which investigated the riot associated with the killing of George Jackson at San Quentin State Prison in 1971?
Sentence (from "San Quentin Six"): The San Quentin Six were six inmates at San Quentin State Prison in the U.S. state of California (Hugo Pinell, Willie Tate, Johnny Larry Spain, David Johnson, Fleeta Drumgo and Luis Talamantez), who were accused of participating in an August 21, 1971 escape attempt that left six people dead, including George Jackson, a co-founder of the Black Guerrilla Family.
Relevant evidence: No