Northern Rhodesia had been detained without trial, following claims that they had planned the indiscriminate killing of Europeans and Asians, and of African opponents, the so-called "murder plot". Shortly afterwards, on 12 March 1959, the governor of Northern Rhodesia also declared a State of emergency there, arrested 45 Zambia African National Congress including Kaunda and banned the party. Kaunda later received a 19-month prison sentence for conspiracy, although no credible evidence of conspiracy was produced. The declaration of States of emergency in both Northern Rhodesia and Nyasaland marked the end of attempts by their nationalist parties to work within the colonial system,
Northern Rhodesia replaced by the more radical Harry Nkumbula. Harry Nkumbula, a schoolteacher from Kitwe, had been given a scholarship to study in London, where he met Hastings Banda. The main African objections to the Federation were summed up in a joint memorandum prepared by Nkumbula for Northern Rhodesia and Banda for Nyasaland in 1950, shortly before Nkumbula returned to Northern Rhodesia. These objections were that political domination by the white minority of Southern Rhodesia would prevent greater African political participation, and that control by Southern Rhodesian politicians would lead to an extension of racial discrimination and segregation. Nkumbula returned to Northern