Millwall

The incident occurred during the height of football hooliganism in the United Kingdom ahead of the 1990 World Cup.

The infamous hooligan described the crazy incident involving Millwall and West Ham United supporters.

The police officer recalled a moment when he lost his temper while taking part in an undercover operation.

The usual Merseyside rivals put aside their differences on a day of violence.

The police officer was undercover in football's toughest firm for two years and had to blend in to achieve the mission.

Frank Harper, a former Millwall hooligan who became a successful actor, named five firms as the toughest he came across.

The notorious football hooligan has described the most brutal fight he was ever involved in.

Bill Gardner fought against many top firms during his days as a football hooligan.

David Beckham once admitted he was scared of facing one of football's toughest players.

The former Chelsea, Man United, and Spurs manager gives his thoughts on what looks to be a transfer bargain

Turki Alalshikh sent football fans into meltdown following his cryptic social media post.

Millwall narrowly missed out on a chance to reach the Premier League.

Bleacher Report named the 10 most dangerous fanbases in world football, with one English club picked.

The notorious Chelsea hooligan has finally settled the debate.

The top 12 'most notorious firms' have been ranked.

The police officer was undercover in the firm for two years and could not blow his cover at any point.

A former Millwall hooligan has named the 'toughest firm' he faced.

The journalist didn't hold back when assessing the worst grounds in English football.

Manchester United, Arsenal and Liverpool are among the teams ranked as the most hated in British football history.

Mateta required 25 stitches after he was kicked in the head by goalkeeper Liam Roberts.