 In response to the measures, Catholic organizations began to intensify their resistance.The most important group was the National League for the Defense of Religious Liberty, founded in 1924, which was joined by the Mexican Association of Catholic Youth, founded in 1913, and the Popular Union, a Catholic political party founded in 1925.In 1926, Calles intensified tensions against the clergy by ordering all local churches in and around Jalisco to be bolted shut.