<a href="https://en.wikipedia.org/wiki/Pope_Leo_XIII" id="mwhQ" rel="mw:WikiLink" title="Pope Leo XIII">Pope Leo XIII</a> defends <a href="https://en.wikipedia.org/wiki/Labor_rights" id="mwhg" rel="mw:WikiLink" title="Labor rights">workers' rights</a> and property rights in the encyclical <i id="mwhw"><a href="https://en.wikipedia.org/wiki/Rerum_novarum" id="mwiA" rel="mw:WikiLink" title="Rerum novarum">Rerum novarum</a></i>, the beginning of modern <a href="https://en.wikipedia.org/wiki/Catholic_social_teaching" id="mwiQ" rel="mw:WikiLink" title="Catholic social teaching">Catholic social teaching</a>.