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 series of major economic, military and penal initiatives. The second stage had three main planks: a large military-sweep of Nairobi leading to the internment of tens of thousands of the city's suspected Mau Mau members and sympathisers (see "Operation Anvil" below); the enacting of major agrarian reform (the Swynnerton Plan); and the institution of a vast villagisation programme for more than a million rural Kikuyu (see below). In 2012, the UK government accepted that prisoners had suffered "torture and ill-treatment at the hands of the colonial administration". The harshness of the British response was inflated by two factors. First, the