This proposal analyses the complex relationships between the Chilean Christian Democratic Party (Partido Democrata Cristiano, PDC), the Church and the political power. From the end of the 1940s to 1973, the Church and the Christian Democracy had parallel evolutions leading to a joint expression of their respective political views. From 1973 to 1990, while the partisan life was non-existent or highly restricted, the Church became a forefront political actor, the voice against the dictatorship. Following the return of democracy, the Christian Democratic Party became again the Church political arm, but it was competed by the right and the context was different: the Chilean society post-Pinochet was depoliticized, deconsecrated and completely entered the market economy and the era of the consumption. Few studies of Chile's PDC have examined its long-term relationship with the Catholic Church and the religious sphere. The period from the late 1950s to 2010, is unevenly documented. Some sources were destroyed during the coup d'état; others are scattered or found in unexpected places. The archives of La Unión, the daily newspaper of the bishopric of Valparaíso, for example, are in the Museo Marítimo Nacional. Diocesan and archdiocesan archives, as well as those of the congregations, are officially non-existent, having been "burnt." The study presented here is therefore based on publications by the Chilean Catholic Church, the newspaper La Unión, the Jesuit review Mensaje, government programs and Christian Democratic press (Política y Espíritu) and works (autobiographies, testimonies, training manuals). Oral and iconographic sources complete this initial collection, such as interviews with Christian Democrats, priests and bishops, as well as the archives of Radio Cooperativa and Canal 13, photographs held by the Casa Museo Frei.