1. Hells Angels
The famous American biker gang has forged a feared reputation over the years. Known for their trademark leather jackets, shaven heads and Harley Davidson motorbikes, the Hells Angels belong to one of the ‘Big Four’ motorcycle gangs, along with the Pagans, Outlaws, and Bandidos. As an organisation, most of their money- if rumours are true- comes from a variety of illegal activities such as drug dealing, trafficking in stolen goods, and prostitution.