The Rioters are one of the many factions in Tom Clancy's The Division.
The Rioters are common, ordinary citizens who have responded to the breakdown of society. Accordingly, they're not necessarily a "faction", but more the chaotic response of ordinary people. Because of this, they are very unpredictable.
The Rioters aren't an "organized" faction per se - they are more a loose collection of individuals. As such, they have enemies in all factions.
Beyond the organized factions roam thugs and outlaws that now rampage through the city, rioting, looting, and assaulting any who come near them. Unafraid to wound or kill, they survive by preying on the weak. They roam in packs, hunting down easy targets and lashing out at authorities when they get the chance. Volatile and dangerous, they are a constant thorn in the side of the JTF and a steady drain on resources.