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 Kenyans suspected of supporting Mau Mau rebels were finally released in April 2012. On 20 October 1952, Governor Baring signed an order declaring a State of Emergency. Early the next morning, Operation Jock Scott was launched: the British carried out a mass-arrest of Jomo Kenyatta and 180 other alleged Mau Mau leaders within Nairobi. Jock Scott did not decapitate the movement's leadership as hoped, since news of the impending operation was leaked. Thus, while the moderates on the wanted list awaited capture, the real militants, such as Dedan Kimathi and Stanley Mathenge (both later principal leaders of Mau Mau's forest