the British government set up a monopoly for the entire protectorate, called it the Sierra Leone Selection Trust, and granted it to De Beers, the giant South African diamond mining company. In 1936 De Beers was also given the right to create the Diamond Protection Force, a private army that would become larger than that of the colonial government in Sierra Leone. Even so, the widespread availability of the alluvial diamonds made the situation difficult to police. By the 1950s, the Diamonds Protection Force was overwhelmed by thousands of illegal diamond miners, a massive source of conflict and chaos. In 1955 the British government opened op some of the diamond fields to licensed diggers outside the Sierra Leone Selection Trust, though the company still kept the richest areas in Yengema and Koidu and Tongo Fields. Things only got worse after independence. In 1970 Siaka Stevens effectively nationalized the Sierra Leone Selection Trust, creating the National Diamond Mining Company (Sierra Leone) Limited, in which the government, effectively meaning Stevens, had a 51 percent stake. This was the opening phase of Stevens’s plan to take over diamond mining in the country.