"Give us our temples, or we will take them!" protested Catholic faithful.
Churches were closed, the Sacraments outlawed and priests became enemies of the state after President Plutarco Elías Calles pushed a statute to enforce the anti-clerical articles of the Mexican Constitution of 1917, which sought to eliminate the power of the Catholic Church.
The result was a civil uprising -- the Cristero War (1926–29). Countless faithful were martyred and 4,000 priests were martyred in or exiled from Mexico for offering the outlawed holy sacrifice of the Mass.