British gang bosses who got the death penalty

[Dwalin2014]

If we look at the period of time when there already was organized crime in Britain, but the death penalty hasn't yet been abolished, were there any cases for a mob boss or gang leader to be hanged? I read some pages available online of James Morton's Gangland Omnibus (2 volumes), and there is a mention of gang boss Antonio Mancini hanged in 1941, and it's said it was the first time in 20 years for a gang leader to be hanged in Britain. Were there any cases after that and who were the gangsters hanged 20 years before?