The movie is based on the life of James Gralton, the only Irishman ever deported from Ireland.
Jimmy emigrated to the United States in 1909, but returned in the early 30’s to help his mother run the family farm. Prior to his emigration, a hall stood on the property and offered free activities (dancing, singing, educational classes) for the poorer children in the county. When Jimmy returns he is encouraged to re-open the hall and, after he does, the Catholic Church denounces him from the pulpit and lines are drawn as to supporters of the Church and supporters of Jimmy Gralton.
Eventually the church and wealthy landowners win and Jimmy is arrested and deported back to the United States.