After months of undercover work, the police in London start moving in their targets and claim their first victory against the hooligan mobs. But the celebrations are short lived. A new piece of science raises doubts over the evidence gathered as part of the police operations. Trials begin to collapse. The police and prosecutors are rattled and start scrutinising other cases yet to go to court. Dozens of cases are eventually dropped and fans previously jailed, have their convictions quashed. After 17 months working undercover among Arsenal’s firms, David is left holding his breath. Meanwhile, for Jim and Andy, the undercover officers in Birmingham, a chance encounter almost blows their cover and sees them running for their lives.

But with the police and politicians breathing down their necks, hooligans across the country are left looking over their shoulders. Is it time to walk away from the fighting and the firms once and for all?

Presenter: Tony Bellew

With the police under pressure to get a grip on the hooligan epidemic, an ambitious young copper comes up with a plan. To infiltrate the firms and go undercover. Covert police operations in London, Birmingham, Manchester and Leeds soon get underway. Michael Layton is a former detective with West Midlands Police. In the mid-80s, he set up an undercover unit which infiltrated the Zulu Warriors, a firm who followed Birmingham City FC. Michael describes how Operation Red Card gathered evidence against the top targets, the danger his undercover officers faced and the constant threat of exposure and reprisals.

For the coppers recruited, it was a terrifying, head-ache inducing, chain-smoking and dangerous life. Two of the officers who risked their lives and infiltrated the Zulu Warriors and another who worked among Arsenal's mobs, tell their stories for the first time.

Presenter: Tony Bellew

With firms doing battle up and down the country, it was only a matter of time before innocent people got hurt. Even some players were attacked as the hooligans went looking for their weekly adrenaline rush. Ordinary football fans were also caught up in the violence. Darts, bottles, fireworks, even sharpened coins would be thrown on the terraces.

This episode also hears from the families of those who died at the hands of thugs. 21 year old Wolves fan Gerald Comerford went to watch his team and never came home. His family describe the devastation of losing their brother. Tony Bellew also hears about the racism that was rife on the terraces. Black players were regularly subjected to vile, racist abuse, often coming from their own fans. Former Chelsea player, Paul Canoville describes the abuse he endured during his early career.

Presenter: Tony Bellew

In the aftermath of the Heysel tragedy, Margaret Thatcher declared war on the hooligans. It was a watershed moment for English football. Tough new laws were called for - and the incident led to English clubs being banned from Europe for 5 years. But there was more trouble on the horizon. The mobs had found a loophole. Friendlies. And in August 1986, that led to a full blown riot on a ferry in the middle of the North Sea.

Some of those onboard the ferry that night tell their side of the story. When the law caught up with those involved, it came down hard.

Presenter: Tony Bellew

1985 saw some of the biggest and bloodiest hooligan riots in British football history. In March, Luton hosted Millwall in an FA Cup tie. Millwall’s notorious mobs rioted before, during and after the game. The Kenilworth Road ground was ripped to pieces, and the town was trashed. Police officer Andy Clarke was left fearing for his life as pieces of concrete and plastic seats were used as missiles.

Just two months later, Leeds and Birmingham’s mobs clashed at St Andrews. Hundreds were injured, and a 15-year-old football fan later lost his life.

But then came one of the darkest nights in football history. On 29 May 1985, 39 people were killed at the Heysel Stadium in Brussels during the European Cup final between Liverpool and Juventus. The tragedy led to English clubs being banned from European football for five years.

Presenter: Tony Bellew

What turns a fan into a fighter? When faced with a choice, do you turn and run, or stand and fight?

We meet the men who found themselves drawn into a world of running battles and riots during the 1970s and 80s. For some, joining a firm and fighting gave them a new identity. For others, it was the first time they truly felt they belonged.

From a young age, Bill Gardner, also known as Mr West Ham, found a home and a family he never had on the terraces of Upton Park, one he would fight for. For adopted Brummie Cockney Al, the early firms in Birmingham took him under their wing, but it was not long before he was up to his neck in it. In Manchester, a childhood plagued by bullying and racism led Fireman Sam to become part of United's hooligan mob, and for Chelsea fan Mark Alleway, being a football hooligan became an addiction.

But not everyone was signing up. Most fans just wanted to go to the game in peace, but trouble was never far away. Football writer Amy Lawrence and DJ Trevor Nelson recall how getting out unscathed on matchdays was not always easy.

The police and politicians soon realised they had a serious problem on their hands. But despite their best efforts, the mobs ruled the terraces. And for a while, it was chaos.

Presenter: Tony Bellew

Former boxing champion and proud Evertonian Tony Bellew delves into the brutal world of football hooliganism. At its height in the 1970s and 1980s, it was labelled ‘the English Disease,’ a time when violence on the terraces was as much a part of the game as a half-time Bovril. Bellew hears from those who lived for the trouble, the men and women whose Saturdays weren’t complete without a brutal punch-up.

He speaks to the innocent victims caught up in the mayhem, the families of those who lost their lives at the hands of thugs, and the undercover police officers who risked everything to infiltrate some of England’s most notorious firms.

He also explores how government crackdowns, tougher laws, and the introduction of all-seater stadiums helped bring an end to widespread hooliganism.

Presenter: Tony Bellew

A brutal attack on a Daniel family member results in lengthy jail sentences for a number of Lyons associates. The feud continues in prison and there are fears it could go on for generations to come.

It was an attack so brutal that police initially thought the victim - a Daniel family member - had been shot in the face or injured by an explosive device. The attack was the culmination of the latest wave of violence in the bitter dispute. A police crackdown on the ongoing feud results in lengthy jail terms for a number of Lyons associates. Meanwhile, presenter Livvy Haydock discovers how Glasgow is successfully fighting back against the violence, with murders and killings now at an all-time low and community groups helping to steer young people away from gangs and crime. But there are still fears that the feud has become so ingrained that it could go on for generations to come.

For a who's who, please visit this BBC article: https://www.bbc.co.uk/programmes/articles/4Czgw23hf0tqsb855CcPKPJ/who-s-who-in-the-story-of-the-daniels-and-the-lyons

Presenter: Livvy Haydock

After his public assassination in a supermarket car park, the hunt for Gerbil's killers begins. A death in the Daniel family heralds a brutal new chapter in the never-ending feud.

With such a high-profile murder, police are under pressure to catch Kevin Carroll's killers, and the manhunt takes an international twist. A high-profile member of the Daniel family dies and after a period of relative calm, the dispute between the two crime groups reignites in a series of brutal attacks. One man is even targeted as he drops his child off at school.

For a who's who, please visit this BBC article: https://www.bbc.co.uk/programmes/articles/4Czgw23hf0tqsb855CcPKPJ/who-s-who-in-the-story-of-the-daniels-and-the-lyons

Presenter: Livvy Haydock

Gerbil is recruited for a kidnapping plot which doesn't go to plan. Meanwhile, he continues his reign of terror as he seeks to build his drug empire - leading to a growing number of enemies out to get him.

Gerbil's reputation is such that he is recruited to carry out a kidnapping by a Liverpool drug gang. Meanwhile, he doubles down on his efforts to take control of the drug trade in parts of Glasgow - taking dealers hostage and threatening them with violence. He gives one dealer an ultimatum and arranges a meet in a supermarket car park. But things take an unexpected and deadly turn.

For a who's who, please visit this BBC article: https://www.bbc.co.uk/programmes/articles/4Czgw23hf0tqsb855CcPKPJ/who-s-who-in-the-story-of-the-daniels-and-the-lyons

Presenter: Livvy Haydock