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The original firm associated with Millwall was known as F-Troop.

The hooligan firm still exists today. However, the firm is not as large as it was at its height in the 1980s. This is due in part to ex-Millwall chairman Theo Paphitis' introduction of a membership scheme following the events outside The New Den on the evening of the Birmingham City play off semi-final in May 2002. Sergeant Russell Lamb of the Metropolitan Police Service, a veteran of the May Day and Poll Tax riots, described this as the worst violence he had ever experienced.

In January 1988, when Millwall were knocked out of the FA Cup by Arsenal in a third round match at Highbury, 41 Millwall hooligans were arrested for disturbances at the game.

In August 1993, Millwall relocated to the New Den and ended that season third in Division One, entering the playoffs to try and win a place in the FA Premier League. However, they were eliminated in the playoff semi-finals by Derby County, and the game at the New Den had to be halted twice due to pitch invasions by Millwall hooligans. There was also widespread fighting in the stands.

In May 2002, after the Division One playoffs brought another semi-final exit for Millwall, 50 police officers were injured when Millwall hooligans attacked them with missiles in the stadium and in the streets surrounding it.