A thieving cowboy, a 12-year-old killer who grew up in the wild and master forgers: Mugshots show the roll call of villains in Leavenworth penitentiary 100 years ago These rare mugshots capture some of the earliest inmates at Leavenworth Penitentiary in eastern Kansas All taken between 1899 and 1919, the photographs show inmates such as thieving cowboy Henry Wilson In its time the prison would play host to the likes of serial killer Carl Panzram and gangster Machine Gun Kelly Henry Wilson, a cowboy who was incarcerated in Leavenworth in 1899 for larceny Al Jennings, leader of the notorious 'Jennings Gang.' The gang conducted heists across the Old West - the most successful of which was the Berwyn train robbery. Jennings was sentenced to life in Leavenworth Prison in 1899 for assault with intent to murder, but following legal efforts by his brother, he was released five years later and went on to become a silent film star A 12-year-old Native-American boy who was simply known as 'Nature Boy' having apparently grown up in the wild without learning any known language. He ended up at Leavenworth after being convicted of murder Mary Snowdon, 21, who was convicted of assault with intent to kill before being sent to Leavenworth jail, which was the largest maximum-strength penitentiary in America at the time LeRoy Pinkett, 23, who was convicted of murder, mutiny and assault with intent to murder during the Houston race riot of 1917 and sent to Leavenworth the same year William Tilgham, Jr, who was convicted of forgery and sent to Leavenworth Federal Penitentiary, Kansas, in 1919. He was the son of a US Marshal, and later an executive of a minor motion picture company William Haywood, was an International Workers of the World (WW) labor leader from Illinois; convicted of obstruction of military service and sedition in 1918 Mary Grayson, 19, was convicted of larceny before being sent to Leavenworth in 1900. Her mugshot was preserved in prison archives along with this brief description of her crime In its time the prison would play host to the likes of serial killer Carl Panzram and gangster Machine Gun Kelly (pictured) .