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Activism

In 1990, he began devoting most of his time to human rights and environmental causes, particularly in the land settled by the Ogoni people. He was one of the earliest members of the Movement for the Survival of the Ogoni People (MOSOP), which advocated for the rights of the Ogoni people. The Ogoni Bill of Rights, written by MOSOP, set out the movement's demands, including increased autonomy for the Ogoni people, a fair share of the proceeds of oil extraction, and remediation of environmental damage to Ogoni lands. In particular, MOSOP struggled against the degradation of Ogoni lands by Royal Dutch Shell.

In 1992, He was imprisoned for several months, without trial, by the Nigerian military government.

He was Vice Chairman of the Unrepresented Nations and Peoples Organization (UNPO) General Assembly from 1993 to 1995. UNPO is an international, nonviolent, and democratic organisation (of which MOSOP is a member). Its members are indigenous peoples, minorities, and under-recognised or occupied territories who have joined together to protect and promote their human and cultural rights, to preserve their environments and to find nonviolent solutions to conflicts which affect them.

In January 1993, MOSOP organised peaceful marches of around 300,000 Ogoni people – more than half of the Ogoni population – through four Ogoni urban centres, drawing international attention to their people's plight. The same year the Nigerian government occupied the region militarily.