Question: The San Quentin Six were six inmates at San Quentin State Prison in the U.S. state of California, they were accused of participating in an escape attempt, on which date, that left six people dead, including George Jackson, a co-founder of the Black Guerrilla Family?
Sentence (from "George Jackson (activist)"): In 1970, he was charged, along with two other Soledad Brothers, with the murder of prison guard John Vincent Mills in the aftermath of a prison fight.
Relevant evidence: No