One chilly November morning in 1927, a slender young priest stood before a firing squad in Mexico City. Five shots cracked through the air, and he fell lifeless on the ground. The man was Miguel Agustin Pro, S.J. His crime? Being a Catholic priest. As a member of the Society of Jesus, Father Pro had worked hard and patiently to bring bread to the poor and the Holy Eucharist to the faithful. Like all Catholic priests in his day, he was deeply...