The Molly Maguires was an 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. After a series of often violent conflicts, twenty suspected members of the Molly Maguires were convicted of murder and other crimes and were executed by hanging in 1877 and 1878. This history remains part of local Pennsylvania lore.
The Molly Maguires originated in Ireland, where secret societies with names such as Whiteboys and Peep o' Day Boys were common beginning in the 18th century and through most of the 19th century. In some areas the terms Ribbonmen and Molly Maguires were both used for similar activism but at different times. The main distinction between the two appears to be that the Ribbonmen were regarded as "secular, cosmopolitan, and protonationalist", with the Molly Maguires considered "rural, local, and Gaelic".
Agrarian rebellion in Ireland can be traced to local concerns and grievances relating to land usage, particularly as traditional socioeconomic practices such as small-scale potato cultivation were supplanted by the fencing and pasturing of land (also known as enclosure). Agrarian resistance often took the form of fence destruction, night-time plowing of croplands that had been converted to pasture, and killing, mutilating, or driving off livestock. In areas where the land had long been dedicated to small-scale, growing-season leases of farmland, called conacre, opposition was conceived as "retributive justice" that was intended "to correct transgressions against traditional moral and social codes".
The victims of agrarian violence were frequently Irish land agents, middlemen, and tenants. Merchants and millers were often threatened or attacked if their prices were high. Landlords' agents were threatened, beaten, and assassinated. New tenants on lands secured by evictions also became targets. Local leaders were reported to have sometimes dressed as women, i.e., as mothers begging for food for their children. The leader might approach a storekeeper and demand a donation of flour or groceries. If the storekeeper failed to provide, the Mollies would enter the store and take what they wanted, warning the owner of dire consequences if the incident was reported.