Frederick Douglass visited Ireland in the decades before the American Civil War, where he met Daniel O'Connell, Ireland's nationalist leader and a vocal critic of slavery. “I am the friend of liberty in every clime, class and colour. My sympathy with distress is not confined within the narrow bounds of my own green island. No — it extends itself to every corner of the earth," O'Connell said at a meeting of his Repeal Association that Douglass attended in September 1845. Here's a look at how his words influenced Douglass's activism: "Agitate, agitate, agitate."