Catholic Social Teaching is a relatively new and growing body of theology. Its foundation can be found in the Bible and Tradition of the Church. However, it began to be formalized beginning in 1891 with the writing of Pope Leo's revolutionary Social Letter/Encyclical, On the New Things/Rerum Novarum. It subsequently has been woven through all the many Social Encyclicals written by the modern popes, right up to the current pope, Francis. This...