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Source/Further reading:

https://www.alcatrazcruises.com/blog/...

https://web.archive.org/web/200809170...

https://www.history.com/thisdayinh...

https://www.biography.com/crimefigur...

http://historicmemphis.com/biographi...

https://memphismagazine.com/features/...

https://www.alcatrazhistory.com/mgk.htm

https://www.fbi.gov/history/famousca...

https://www.fbi.gov/history/famousca...

https://archives.fbi.gov/archives/new...

https://web.archive.org/web/201412281...

https://www.alcatrazcruises.com/blog/...