https://en.wikipedia.org/wiki/Alcatraz_Island
https://www.fbi.gov/history/famous-cases/al-capone
https://graylineofsanfrancisco.com/blog/alcatrazs-most-dangerous-inmates/
https://www.thoughtco.com/james-whitey-bulger-biography-4176370
https://www.alcatrazcruises.com/blog/2018/09/10/james-whitey-bulger-was-no-ordinary-criminal/
https://en.wikipedia.org/wiki/Robert_Stroud
http://listverse.com/2018/10/06/10-infamous-alcatraz-inmates/
https://www.fbi.gov/history/famous-cases/machine-gun-kelly
https://en.wikipedia.org/wiki/Morton_Sobell
https://en.wikipedia.org/wiki/Alvin_Karpis
https://en.wikipedia.org/wiki/Henri_Young
https://en.wikipedia.org/wiki/June_1962_Alcatraz_escape_attempt