Billy the Kid Gang (1876-1880)
Bummers Gang (1855-1860)
Alvord-Stiles Gang (1899)
California Outlaws (1880's)
Clanton Gang (1870's)
Dalton Gang (1891-1892)
Daly Gang (1862-1864)
Doolin Gang (1892-1895)
Farrington Brothers (1870-1871)
The Hole in the Wall Gang (1890's)
James-Younger Gang (1866-1882)
McCanles Gang (1861)
McCarty Gang (1892-1893)
Musgrove Gang (1867-1868)
Reno Gang (1866-1868)
Reynolds Gang (1863-1864)
Rufus Buck Gang (1895-1896)
Wild Bunch (c. 1890-1902)
Younger Brothers (1866-1876)
Gunfighters.
Robert Clay Allison (1840-1887)
Billy Claiborne (1860-1882)
John "King" Fisher (1854-1884)
John Wesley Hardin (1853-1895)
Tom Horn (1860-1903)
Jack Johnson "Turkey Creek",
Franklyn Leslie "Buckskin Frank", (1842?-192?)
William P. Longley "Wild Bill", (1851-1877)
Jim Miller
James Riley [Jim Riley] (1853-18??)
Luke Short (1854-1893)
Ben Thompson (1843-1884)