Mau Mau Uprising given rise to three native Kenyan political blocks: "conservative", "moderate nationalist" and "militant nationalist". It has also been argued that Mau Mau was not explicitly national, either intellectually or operationally. Bruce Berman argues that, "While Mau Mau was clearly not a tribal atavism seeking a return to the past, the answer to the question of 'was it nationalism?' must be yes and no." As the Mau Mau rebellion wore on, the violence forced the spectrum of opinion within the Kikuyu, Embu and Meru to polarise and harden into the two distinct camps of loyalist and Mau Mau. This neat division
Mau Mau Uprising it fell to Dr. John Colin Carothers to perform the desired analysis. This ethnopsychiatric analysis guided British psychological warfare, which painted Mau Mau as "an irrational force of evil, dominated by bestial impulses and influenced by world communism", and the later official study of the uprising, the Corfield Report. The psychological war became of critical importance to military and civilian leaders, who waged it in the time-honoured colonial fashion of divide and rule, always trying to "emphasise that there was in effect a civil war, and that the struggle was not black versus white", attempting to isolate Mau Mau from