Portal:Catholic Church/Selected article/20
![Pope Leo XIII](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Leo-xiii-sm.jpg/100px-Leo-xiii-sm.jpg)
Catholic social teaching comprises those aspects of Catholic doctrine which relate to matters dealing with the collective aspect of humanity. The foundations of modern Catholic social teaching are widely considered to have been laid by Pope Leo XIII's 1891 encyclical letter Rerum Novarum. A distinctive feature of Catholic social teaching is its concern for the poorest members of society. This concern echoes elements of the Jewish law and of the prophetic books of the Old Testament, and recalls the teachings of Jesus Christ recorded in the New Testament, such as his declaration that "whatever you have done for one of these least brothers of Mine, you have done for Me." Another distinctive feature of Catholic social doctrine is the way in which it has consistently critiqued modern social and political ideologies both of the left and of the right: communism, conservatism, socialism, libertarianism, capitalism, liberalism and Nazism have all been condemned, at least in their pure forms, by the Popes at one time or another.
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