On November 23, 1927, Pro was executed without trial. President Calles gave orders to have Pro executed for the assassination attempt. Calles had the execution meticulously photographed, and the newspapers throughout the country carried photos on the front page the following day. Presumably, Calles thought that the sight of the pictures would frighten the Cristero rebels who were fighting against his troops, particularly in the state of Jalisco. However, they had the opposite effect.