Who is Che Guevara from Pedagogy of the Oppressed and what is their importance?

Che Guevara was a communist freedom fighter who worked with Fidel Castro in Cuba and also fought in many South American countries. Freire quotes Guevara as telling a Guatemalan revolutionary not to trust anyone until an area is liberated. Freire also cites Guevara, acting as a doctor in the Sierra Maestra as well as a guerrilla fighter, writing that, from working closely with the people, the guerrillas and the peasants became unified as a true community.