The Kray twins were gangsters.
 They were assisted by a banker named Alan Cooper who wanted protection against the Krays' rivals, the Richardson Gang, based in South London
 The Krays were the owners of four nightclubs where gambling was allowed, which not only allowed them to be seen as successful businessmen, but also to socialise with the 'decent' people who would had previously shunned at least in public the company of gangsters running a "gambling den"

