Mau Mau Uprising arable and grazing land. During the Emergency, "screening" was the term used by colonial authorities to mean the interrogation of a Mau Mau suspect. The alleged member or sympathiser of Mau Mau would be interrogated in order to obtain an admission of guilt—specifically, a confession that they had taken the Mau Mau oath—as well as for intelligence. Mau Mau Uprising The Mau Mau Uprising (1952–1964), also known as the Mau Mau Rebellion, the Kenya Emergency, and the Mau Mau Revolt, was a war in the British Kenya Colony (1920–1963). The definition of the term "Mau Mau" has been contentious. The
Mau Mau Uprising as "a complete blueprint for winning the war against Mau Mau using socioeconomic and civic reform." What developed, however, has been described as a British gulag. The Pipeline operated a white-grey-black classification system: 'whites' were cooperative detainees, and were repatriated back to the reserves; 'greys' had been oathed but were reasonably compliant, and were moved down the Pipeline to works camps in their local districts before release; and 'blacks' were the so-called 'hard core' of Mau Mau. These were moved up the Pipeline to special detention camps. Thus a detainee's position in Pipeline was a straightforward reflection of how cooperative