He emigrated to New York in late 1882 to work for Patrick Ford's Irish World newspaper, which had been the largest fund-collector for the Land League and promoted radical views in opposition to Parnell. In March 1883, Brennan moved to Omaha, Nebraska where he led a career as an attorney. He became a well-known lecturer for the Irish National League of America, and he traveled across the US continuing to criticise Parnell and the wider Home Rule movement as being too centered on Westminster, and instead advocated educating the Irish populace in non-violent republicanism.Janis, pp. 106-108 Despite his close contacts with Clan na Gael, Brennan opposed the Fenian dynamite campaign of the 1880s on the grounds that it harmed the reputation of the Irish republican movement.
