Mau Mau Uprising between loyalists and Mau Mau was a product of the conflict, rather than a cause or catalyst of it, with the violence becoming less ambiguous over time, in a similar manner to other situations. Philip Mitchell retired as Kenya's governor in summer 1952, having turned a blind eye to Mau Mau's increasing activity. Through the summer of 1952, however, Colonial Secretary Oliver Lyttelton in London received a steady flow of reports from Acting Governor Henry Potter about the escalating seriousness of Mau Mau violence, but it was not until the later part of 1953 that British politicians began to accept
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