Operation Anvil (Mau Mau Uprising) the reserves. The "Grey" grade was made up of prisoners believed to be passive Mau Mau sympatherisers though for whom strong evidence suggesting their true loyalties was lacking. The last category, "Black", was reserved for detainees identified by the hooded informers or the Special Branch of the Kenya Police as potentially violent insurgents or terrorists. A few may have been prosecuted by the government, but most were funneled through the "Pipeline", a system of work camps, decreasing in brutality until an individual was "re-educated" and deemed safe to release on a native reserve. Operation Anvil (Mau Mau Uprising) Operation Anvil
Mau Mau Uprising the Pipeline personnel deemed her or him to be. Cooperation was itself defined in terms of a detainee's readiness to confess their Mau Mau oath. Detainees were screened and re-screened for confessions and intelligence, then re-classified accordingly. A detainee's journey between two locations along the Pipeline could sometimes last days. During transit, there was frequently little or no food and water provided, and seldom any sanitation. Once in camp, talking was forbidden outside the detainees' accommodation huts, though improvised communication was rife. Such communication included propaganda and disinformation, which went by such names as the "Kinongo Times", designed to encourage