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 archival material was finally brought to light, while yet more was discovered to be missing. The files, known as "migrated archives", provided details of British human rights abuses (torture, rape, execution) in its former colonies during the final stages of empire, including during Mau Mau, and even after decolonisation. Regarding the Mau Mau Uprising, the records included confirmation of "the extent of the violence inflicted on suspected Mau Mau rebels" in British detention camps documented in Caroline Elkins' study. Numerous allegations of murder and rape by British military personnel are recorded in the files, including an incident where a native