Catholic Social Teaching Rerum Novarum (Of New Things), by Pope Leo XIII, on Capital and Labor [1891]Apostolicam Actuositatem (Apostolic Activity), the Second Vatican Council’s Decree on the Apostolate of the Laity [1965]Populorum Progressio, by Pope Saint Paul VI, on the Progressive Development of Peoples [1967]Humanae Vitae (On Human Life), by Pope Saint Paul VI, on the Regulation of Birth [1968]Sollicitudo Rei Socialis (Social Concern), by Pope Saint John Paul II, on the twentieth anniversary of Populorum Progressio [1987]Caritas in Veritate (Charity in Truth), by Pope Benedict XVI, on Integral Human Development. [2009]