Question: Alexander Campbell, was a tavern owner, who, with three other convicted, was hanged for the murders of two mine operatives, which  Irish 19th-century secret society active in Ireland, Liverpool and parts of the eastern United States, best known for their activism among Irish-American and Irish immigrant coal miners in Pennsylvania?
Sentence (from "Alexander Campbell (suspected Molly Maguire)"): Alexander Campbell (c. 1833 – June 21, 1877) was a tavern owner, who, with three other convicted Molly Maguires, was hanged for the murders of two mine operatives.
Relevant evidence: Yes