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 further screening, primarily at Langata Screening Camp, whilst women and children were readied for 'repatriation' to the reserves (many of those slated for deportation had never set foot in the reserves before). Anvil lasted for two weeks, after which the capital had been cleared of all but certifiably loyal Kikuyu; 20,000 Mau Mau suspects had been taken to Langata, and 30,000 more had been deported to the reserves. For an extended period of time, the chief British weapon against the forest fighters was air power. Between June 1953 and October 1955, the RAF provided a significant contribution to the conflict—and,