SOURCES:

• The Kray Twins: London’s Most Notorious Twins Documentary
• 2015 film ‘Legend’ starring Tom Hardy

wikipedia.org

Meet The Kray Twins, The Fearsome Gangster Brothers Who Ruled London’s Underworld In The 1960s

allthatsinteresting.com

87 Ronald And Reginald Kray Photos & High Res Pictures

gettyimages.com

Behind the Legend: how accurate is Tom Hardy's Krays drama?

theguardian.com

Kray Twins: The Killer Truth Behind the Criminal Legends

huffpost.com