At one point, jamaican posses and dominican groups were really active, from the north east to the south of the US.
Jamaican posses were getting cocaine from colombians, and distributing it to jamaican posses already established in american cities. The jamaicans tried to take the territory already established by african americans. Jamaicans were straight killers.
Dominicans were also the plugs to many gangs in NYC.
The Jamaican groups are still active and a few turf conflicts happened between black crime groups but the bulk of the violence was between different posses/crews.
