Does the real Shelby family exist?

It is true that the Shelby family is a famous gangster "razor party" in British history.

Razor gang was one of the street gangs in Sheng Xing, Glasgow, England during the period of 1920- 1930. It is known from the name that they mainly use razors as weapons. The advantage of razors is that they can be bought from barbershops. They are very cheap and easy to hide in your body. There is a reasonable explanation when you meet the police, and it is enough to cause disfigurement, scars and even death.

The rise of local gangs in Glasgow is mainly due to the high unemployment rate and the influx of Irish Catholic immigrants, which has caused religious opposition. In some cases, gangs even clashed with the police.