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 "Black Guerrilla Family"): The Black Guerilla Family, or BGF (also known as the Black Family or the Black Vanguard) is an African-American prison and street gang founded in 1966 by George Jackson and W.L. Nolen while they were incarcerated at San Quentin State Prison in Marin County, California.
Relevant evidence: Yes