José Vilasuso, a lawyer and a professor at Universidad Interamericana de Bayamón in Puerto Rico, who belonged to the body in charge of the summary judicial process at La Cabaña, told me recently that

Che was in charge of the Comisión Depuradora. The process followed the law of the Sierra: there was a military court and Che’s guidelines to us were that we should act with conviction, meaning that they were all murderers and the revolutionary way to proceed was to be implacable. My direct superior was Miguel Duque Estrada. My duty was to legalize the files before they were sent on to the Ministry. Executions took place from Monday to Friday, in the middle of the night, just after the sentence was given and automatically confirmed by the appellate body. On the most gruesome night I remember, seven men were executed.

Javier Arzuaga, the Basque chaplain who gave comfort to those sentenced to die and personally witnessed dozens of executions, spoke to me recently from his home in Puerto Rico. A former Catholic priest, now seventy-five, who describes himself as “closer to Leonardo Boff and Liberation Theology than to the former Cardinal Ratzinger,” he recalls that

there were about eight hundred prisoners in a space fit for no more than three hundred: former Batista military and police personnel, some journalists, a few businessmen and merchants. The revolutionary tribunal was made of militiamen. Che Guevara presided over the appellate court. He never overturned a sentence. I would visit those on death row at the galera de la muerte. A rumor went around that I hypnotized prisoners because many remained calm, so Che ordered that I be present at the executions. After I left in May, they executed many more, but I personally witnessed fifty-five executions. There was an American, Herman Marks, apparently a former convict. We called him “the butcher” because he enjoyed giving the order to shoot. I pleaded many times with Che on behalf of prisoners. I remember especially the case of Ariel Lima, a young boy. Che did not budge. Nor did Fidel, whom I visited. I became so traumatized that at the end of May 1959 I was ordered to leave the parish of Casa Blanca, where La Cabaña was located and where I had held Mass for three years. I went to Mexico for treatment. The day I left, Che told me we had both tried to bring one another to each other’s side and had failed. His last words were: “When we take our masks off, we will be enemies.”

The Killing Machine: Che Guevara, from Communist Firebrand to Capitalist Brand

http://www.independent.org/newsroom/article.asp?id=1535