Red Doors
Red Doors was originally a fictional terrorist organisation invented by the Sorvix as a scapegoat for 3Sol's actions. However, it became a real thing with racists such as Xander forming a true Red Doors with the goal of getting rid of the Sorvix and minorities from Cardiff. (AUDIO: Poker Face)
As part of their attempts to keep the Sorvix from gaining power, Red Doors killed Detective Inspector Pete Bunton and Professor Helen White, both of whom were tools in Ro-Jedda's plan to outsource policing to 3Sol. Xander found Jack Harkness to get help from him and told him about Red Doors' activities. (AUDIO: The Empty Hand)
Yvonne Hartman successfully used Jack's interactions with Red Doors to convince the Torchwood team that he betrayed them, allowing her to take charge. (AUDIO: Poker Face) He did so. St John Colchester accused him of supplying Red Doors with psychic worms that they then unleashed on the people of Cardiff. (AUDIO: Tagged)
Jack became the leader of the group. Red Doors mainly targeted empty offices and Sorvix targets. Jack attempted to stop them from bombing Cardiff Airport but was unsuccessful. The attack led to Yvonne and Ro-Jedda joining forces to wipe out Red Doors. (AUDIO: Herald of the Dawn)