The history of vigilante justice and the Montana Vigilantes began in 1863 in what was at the time a remote part of eastern Idaho Territory. Vigilante activities continued, although somewhat sporadical
Bannack, Montana (2005)
1907 Painting by John W. Norton of Henry Plummer's gang holding up and robbing a stagecoach
1870 vigilante execution of Arthur Compton and Joseph Wilson in Helena, Montana]
Lynching of Compton and Wilson 1870
3-7-77 is a symbol originally used by the Montana Vigilantes, a 19th-century vigilance committee in Virginia City, Montana, United States.
Montana Vigilantes
…Stuart's actions was reflected by his election as the first president of the Montana Stockgrower's Association in late July 1884. The numerical symbol 3-7-77 has long been associated with Montana vigilantes. Its meaning is unclear though many theories have been put forward trying to explain what it symbolized…
Montana Highway Patrol patch
Robber's Roost in Madison County, Montana is listed on the National Register of Historic Places