This article describes the origins of "Unión Social Centro Obrero", USCO, in Bogotá, which, in 2013, gave its land and buildings to Fundacion Universitaria Monserrate. The initial actions of USCO are part of Colombian Catholicism dynamics during in the fifth decade of the twentieth century, included in the program defined by the Episcopal Conference in 1945, which determined, for many years, the social work of the Church, its methods and perspectives in relation to social changes, the attitude towards the marginalization of crowds, the secularization of everyday life and the redistribution of economic growth profits.