Why is Che Guevara criticized for his role in executions after the Cuban Revolution?

Che Guevara is criticized for his role in executions because he directly participated in and oversaw the killing of individuals deemed enemies of the revolution. Following the success of the Cuban Revolution, Guevara served at La Cabaña prison in Havana, where he supervised the execution of those identified as opponents of the new government.1

Additionally, during the guerrilla campaign to overthrow the dictatorship of Fulgencio Batista, Guevara acted as an executioner or ordered the execution of individuals suspected of being traitors or deserters. Because of these actions, many critics on the political right have condemned him as brutal, cruel, and murderous, arguing that he was excessively willing to employ violence to achieve his revolutionary objectives. Ethical principles demand that the use of state-sanctioned violence and the deprivation of life must be subject to rigorous standards of justice and human rights, and the summary execution of individuals without due process is a profound violation of these fundamental moral values.12