People / parties
There are multiple factions who have involvement in this part of the world and especially in Nigeria. You of course have the people like Ken Saro-Wiwa and the Ogoni Tribe or the Ijaw who have spoken out against how they feel their lives and rights have been exploited by the government and oil companies. The you have the oil companies themselves like Chevron and Shell who have admitted to irresponsibility in causing some environmental damage but have been accused of more than just those faults.