Idi Amin Kampala suburb of Nakasero became the scene of torture and executions over the next few years. Other agencies used to persecute dissenters included the military police and the Public Safety Unit (PSU). Obote took refuge in Tanzania, having been offered sanctuary there by the Tanzanian President Julius Nyerere. Obote was soon joined by 20,000 Ugandan refugees fleeing Amin. The exiles attempted but failed to regain Uganda in 1972, through a poorly organised coup attempt. Amin retaliated against the attempted invasion by Ugandan exiles in 1972, by purging the army of Obote supporters, predominantly those from the Acholi and Lango ethnic
History of Uganda (1971–79) which Obote had attempted to dismantle. They seemed willing to forget that their new president, Idi Amin, had been the tool of that military suppression. Amin made the usual statements about his government's intent to play a mere "caretaker role" until the country could recover sufficiently for civilian rule. Amin repudiated Obote's non-aligned foreign policy, and his government was quickly recognized by Israel, Britain, and the United States. By contrast, presidents Julius Nyerere of Tanzania, Kenneth Kaunda of Zambia, Jomo Kenyatta of Kenya, and the Organization of African Unity (OAU) initially refused to accept the legitimacy of the new military