For the past decade and a half, Latin American Catholicism has been a focal point of extraordinary religious change and political activism. Although the first visible signs of religious renewal in the traditionally conservative Latin American church did not appear until the early 1960s, a mere decade later, in 1972, Christians for Socialism had held an international meeting of radical Christians in Santiago, Chile. Today, Latin American bishops and Christian base communities throughout the continent are deeply involved in the struggle to preserve human rights against the encroachments of authoritarian regimes. One of the most controversial aspects of the changing Latin American church has been the emergence of organized movements of Christian radicals who sought to use religion as a base from which to transform society through political action. Sizeable priest movements of the left appeared in such countries as Argentina, Chile, Colombia and Peru, where they had a notable impact on national politics. Acting from the premise that Christian faith must be linked to social action to be meaningful, radicalized Christians joined a dialogue with Marxism, denounced social injustices, provided leadership to politically marginal groups and struggled to change the very nature of the Latin American Catholic Church. The rationale and justification of such action was provided in the collection of writings known as the theology of liberation.