Mob rule

The 20th century was a golden age for organised crime groups. Ryan Gingeras reveals how gangs from the Sicilian Mafia to Mexico's cartels capitalised on political chaos, economic upheaval and mass migration to spread their tentacles around the world

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In the early 1860s Sicily was incorporated into the Kingdom of Italy.

Soon after, visitors to the island discovered what they believed was a criminal fraternity at work in Palermo and its environs. That fraternity - the 'Mafia' - possessed secret rites and bylaws that governed its members. Chief among their rules was the vow of silence, omertà, when it came to their interactions with the police.

Many assumed this 'honoured society' was born out of the prisons of Palermo, a place where hardened criminals mixed with members of secret revolutionary organisations. Before 1900, Mafiosi distinguished themselves by a clear pattern of criminal behaviour. Brigand gangs who robbed travellers on the roads were bound to the Mafia. Large landowners and government officials abetted the murders, thefts and acts of extortion mafiosi committed.

Yet there were aspects of what Mafia was that remained difficult to pin down. Mafiosi, Palermo's mayor told one public enquiry, could be "anyone who has self-respect and has a certain exaggerated pride, and the inclination to not be overwhelmed but to overwhelm others, the will to appear courageous, to be ready to fight, and so on".

For people in the 19th century, what made Sicily's Mafia significant was the threat it posed to the government in Rome. Mafiosi appeared to rule the island from the shadows. The violence associated with them was used to intimidate citizens and to demonstrate its power to the Italian capital.