"...The trailers I have seen would make this appear to be a remarkable film both for content and in the accuracy of historical detail. P. E. Calles was a classic semi-educated politicized intellectual thug. In 1940 when President Camacho deported him to a comfortable exile in los Angeles his bedside reading material was ‘Mien Kampf’"
When you wrote President Camacho I am sure you meant President Lázaro Cárdenas instead. Both Cárdenas and his predecessor Plutarco Elías Calles were interesting figures. Calles is even thought by some to be the author of "The Treasure of the Sierra Madre". Calles was a former bartender in Los Angeles before returning to Mexico after the revolution, and when his term as president ended, he had believed that Cárdenas would be a safe choice as his successor, a weakling that he could push around to preserve his influence. He was wrong: at the first whiff of a plot against him Cárdenas had Calles rounded up in the middle of the night and dumped across the border, back from where he came. It was reported that Calles was astonished that he survived, and was not shot out of hand, as he would have had done were the situation reversed.
Also, check out the many long comments at the end of the Wikipedia article on the Cristero War to see how controversial this subject still is.
I actually thought Calles was expelled by Camacho. Cardenas was, what ever socialist beliefs he had, a humane man and didn't execute Calles and his cronies for conspiracy. That would also have marred Mexico's image as a country of laws which Cardenas was very interested in cultivating. Ironically if the church had staid as torpid, remote and uninvolved in the lives of the poor no revolt would have happened. Since a growing number of priests and laity had been building institutions such as CYA which tied to bring amelioration as well as theology to the urban and rural lower classes since shortly before the 1910 revolution the affected peasants took up the cause of the only people who had ever shown the least interest in their existence with a real fierce passion.