During his first years at San Quentin State Prison, Jackson became involved in revolutionary activity. He was described by prison officials as egocentric and anti-social. In 1966, Jackson met and befriended W.L. Nolen who introduced him to Marxist and Maoist ideology. The two founded the Black Guerrilla Family in 1966 based on Marxist and Maoist political thought. In speaking of his ideological transformation, Jackson remarked "I met Marx, Lenin, Trotsky, Engels, and Mao when I entered prison and they redeemed me."