https://en.wikipedia.org/wiki/Alvin_Karpis
Alvin Karpis was one of the 4 big time gangsters from the 30's (Dillinger, Floyd, Nelson) who were the only Public Enemy #1:
Karpis served the longest sentence of any prisoner at Alcatraz: 26 years.
[14] In April 1962, with Alcatraz in the process of being closed, he was transferred to
McNeil Island Penitentiary in
Washington state. While at McNeil, Karpis met a young
Charles Manson. Karpis wrote about Manson in his autobiography with Robert Livesey (1980):
[15]
This kid approaches me to request music lessons. He wants to learn
guitar and become a music star. “Little Charlie” is so lazy and shiftless, I doubt if he'll put in the time required to learn. The youngster has been in institutions all of his life —first orphanages, then reformatories, and finally federal prison. His mother, a prostitute, was never around to look after him. I decide it's time someone did something for him, and to my surprise, he learns quickly. He has a pleasant voice and a pleasing personality, although he's unusually meek and mild for a convict. He never has a harsh word to say and is never involved in even an argument.
After Manson had become somewhat proficient on the guitar, he asked Karpis for help in getting a job playing in
Las Vegas, as Karpis had contacts with nightclub and
casino owners there. Manson told him he would be bigger than the
Beatles, but Karpis decided to leave Manson on his own regarding his music career.