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William O’Brien (born October 2, 1852, Mallow, County Cork, Ireland—died February 25, 1928, London, England) was an Irish journalist and politician who was for several years second only to Charles Stewart Parnell (1846–91) among Irish Nationalist leaders. He was perhaps most important for his “plan of campaign” (1886), by which Irish tenant farmers would withhold all rent payments from landlords who refused to lower their rents and would pay the money instead into a mutual...