Catechism of the Catholic Church §1867 — excerpt
The catechetical tradition also recalls that there are "sins that cry to heaven": the blood of Abel, The sin of the Sodomites, The cry of the people oppressed in Egypt, The cry of the foreigner, the widow, and the orphan, injustice to the wage earner.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.