STC375638 Execution of the Pro brothers, Mexico City, 23rd November 1927 (b/w photo) by Galloway, Ewing (fl.1927); Private Collection; (add.info.: from \'The Wind that Swept Mexico: The History of the Mexican Revolution of 1910-1942\'; Miguel, Roberto and Humberto Pro were Jesuit priests who ran underground churches in defiance of the harshly anti-clerical laws that President Plutarco Elias Calles (1877-1945) (elected 1924) had introduced in 1926; An unsuccessful assassination attempt on former President Alvaro Obregon provided the pretext for their execution; The Cristero War or Cristiada (1926-9) saw Catholics take up arms against the state;); The Stapleton Collection; American, out of copyright.