Since it's all about the gang war, we should probably mention the six featured and playable gangs, the information featured is based on media released so far and is likely not to be of a high accuracy.

Name: Reds (name unknown)
Colour: Red
Location: West London
Clothing: Yakuza Threads
Known Enemies: EC2 Crew

Name: Zaknarov
Colour: Green
Location: South west London
Clothing: Suits
Known Enemies: EC2 Crew, Kane

Name: Talwar
Colour: Purple
Location North London
Clothing: Casual
Known Enemies: (No Information)

Name: EC2 Crew
Colour: Yellow
Location: North East London
Clothing: Baseball caps, Hoodees
Known Enemies: Zaknarov, Reds

Name: Kane
Colour: Orange
Location: South East London
Clothing: Jeans, usually Brown Jackets
Known Enemies: Zaknarov, Steele Associates

Name: Steele Associates
Colour: Blue
Location: Central London
Clothing: Navy Blue Suits
Known Enemies: Appear to be enemies with Kane