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Inside violent 'Football Factory' hooligan firms infiltrated by daring undercover agents
Chelsea's Headhunters claim to be one of the original football hooligan firms in England. Their roots can be traced back to the 1960s and 70s when hooliganism was in its infancy and they were known as the 'Chelsea Shed Boys.' However, they rose to notoriety in the 1980s and 1990s when violence at football was an all-too-often occurrence.
