Walker was reportedly involved in illegal mining operations in Sierra Leone, where conflict diamonds (also known as "blood diamonds") were often extracted. These diamonds have historically been linked to funding violent conflicts and human rights abuses in several African countries, including Sierra Leone.
Walker’s activities in Sierra Leone involved controlling or working in diamond mines in the region, an area notorious for its history of exploitation and corruption. He reportedly profited from the illegal trade of diamonds, and his actions have led to some legal troubles and controversy in both the UK and Africa.
While the details around his operations are murky, his connections to the diamond trade and organized crime are significant enough that he has been a subject of legal investigation. However, the full extent of his role and involvement in illegal diamond mining may not be entirely clear to the public.