After growing up in a poor gypsy camp, Edmond Vidal, aka Momon, has retained a sense of family, unfailing loyalty and pride in his origins. Most of all, he has remained friends with Serge Suttel, with whom he first discovered prison life - for stealing cherries. The two of them inevitably got involved in organized crime. The team they formed, the Ganf Des Lyonnais, made them the most notorious armed robbers of the early 1970s. Their irresistible rise ended in 1974 with a spectacular arrest. Today, as he nears 60, Momon would like to forget that part of his life. He has found peace by retiring from the "business". He tends to his wife Janou, who suffered so in the past, and to his children and grandchildren, all of whom have great respect for this man of simple and universal values, so clear-headed and full of kindness. But then Serge Suttel, who has disowned nothing of his past, comes back into the picture.
Unfortunately the movie A Gang Story is not yet available on HBO Max.
| Directing | Olivier Marchal | Director |
| Production | Cyril Colbeau-Justin | Producer |
| Writing | Olivier Marchal | Screenplay |
| Production | Jean-Baptiste Dupont | Producer |
| Writing | Edgar Marie | Screenplay |
| Production | David Giordano | Executive Producer |
| Writing | Edmond Vidal | Novel |
| Camera | Denis Rouden | Director of Photography |
| Production | Sylvie Brocheré | Casting |
| Editing | Raphaële Urtin | Editor |
| Sound | Pierre Mertens | Sound Mixer |
| Costume & Make-Up | Nathalie Marchaud | Hairstylist |
| Art | Valérie Rozanes | Art Direction |
| Costume & Make-Up | Emmanuel Pitois | Special Effects Makeup Artist |
| Art | Paul Mauris-Blanc | Set Decoration |
| Costume & Make-Up | Dorothée Soual | Wigmaker |
| Sound | Jean-Paul Hurier | Sound Re-Recording Mixer |
| Sound | Boris Chapelle | Dialogue Editor |
| Sound | Marc Doisne | Sound Re-Recording Mixer |
| Sound | Philippe van Leer | Foley Artist |
| Art | Ambre Fernandez | Production Design |
| Art | Boris Piot | Set Decoration |
| Costume & Make-Up | Julie Brenot | Makeup Artist |
| Sound | Alain Lévy | Sound |
| Costume & Make-Up | Agnès Falque | Costume Design |
| Sound | Erwann Kermorvant | Original Music Composer |
| Costume & Make-Up | Pascal Thiollier | Key Makeup Artist |
| Costume & Make-Up | Catherine Bruchon | Key Makeup Artist |
| Costume & Make-Up | Alexandra Bredin | Key Hair Stylist |
| Costume & Make-Up | Gérald Portenart | Key Hair Stylist |
| Production | Gilles Waterkeyn | Co-Producer |
| Production | Jeremy Burdek | Co-Producer |
| Production | Adrian Politowski | Co-Producer |
| Production | Nadia Khamlichi | Co-Producer |
| Directing | Diane Brasseur | Script Supervisor |
| Crew | Alain Figlarz | Stunt Coordinator |
| Production | Sylvain Goldberg | Co-Producer |
| Production | Serge de Poucques | Co-Producer |
| Sound | Frédéric Attal | Supervising Sound Editor |
| Directing | Ivan Fegyveres | First Assistant Director |
