I was watching "Public Enemies" last night, a two fisted portrayal of the Barker gang.
This is Theresa Russell who portrayed Ma Barker:
This is a photo of the real Arizona Clark, aka Kate "Ma" Barker:
The Barker gang even robbed a train, which would seem anachronistic, except that Ma Barker has been born in 1872 in Missouri, the hey day of the James-Younger gang.
The real story of Ma Barker is less colorful and while she did go on the run to take care of her boys, by some accounts some of the most vicious, ruthless killers who ever lived, while her sons were out robbing and killing, Ma Berker liked to spend her free time at the movies. Kate Barker would've been tickled at the idea of becoming a Hollywood myth.
By the way, Alvin "creepy" Karpis, portrayed in Public Enemies as being near middle age, was actually in his 20s at the time, and in real life would later serve a long stretch in federal prisons, becoming a mentor and guitar teacher to a young, impressionable Charlie Manson. Karpis later was paroled and deported back to Canada, and retired and died in Spain.