One of the most outspoken critics of peaceful coexistence during the early 1960s was Argentine Marxist revolutionary Che Guevara. As a leader in the Cuban government during the October Missile Crisis, Guevara believed that a repeat invasion by the United States (after the Bay of Pigs) would be justifiable grounds for a nuclear war. In Guevara's view, the capitalist bloc was composed of "hyenas and jackals" that "fed on unarmed peoples".