<P> One such move, in regard to land reform, was to nationalize most farmland and give it to the peasants across Mexico . He also put into effect a national school system that was largely secular to combat church influence in late 1924 . After two years the church protested the movement by refusing to give the blessed sacrament to the populace . Some peasants also joined in the protests, adding greater land reforms to the list of demands by the rebelling priests . The rebellion was openly supported by the Catholic Church and received funding, beginning the Cristero War . </P> <P> Meanwhile, in 1927, another military coup was attempted, this time receiving support from land owners . Calles quickly crushed the rebellion with help from the newly mobilized peasant battalions, who later on were used to fight against the Church . In the midst of the mobilized worker's militias, land reform, and anti-church actions, the American government began to openly declare Mexico a Bolshevik regime . To recover from the backlash, Calles began to tone down the radical rhetoric and slowed land reform policies in 1928 . A year later, Calles defeated the church ending the rebellion . </P> <P> After the war ended in 1929, supporters of Calles and Obregón began to form a united political party called the National Revolutionary Party or PNR . This was to unite the various revolutionary factions of the civil war to prevent further Cristero revolts and build stability . </P> <P> After a series of interim presidents controlled by the party, Lázaro Cárdenas took power in 1934 . Cárdenas was a socialist and began to base government policy on class struggle and empowering the masses . However, not all of his reforms were completely socialist, making him somewhat more centrist than purely socialist . Regardless, his rule was the most radical phase of the post revolution, social revolution . </P>

Who were the leaders that emerged during the early stages of the revolution