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
Idi Amin Wilson Oryema and Charles Oboth Ofumbi. Amin recruited his followers from his own ethnic group, the Kakwas, along with South Sudanese. By 1977, these three groups formed 60 percent of the 22 top generals and 75 percent of the cabinet. Similarly, Muslims formed 80 percent and 87.5 percent of these groups even though they were only 5 percent of the population. This helps explain why Amin survived eight attempted coups. The army grew from 10,000 to 25,000 by 1978. Amin's army was largely a mercenary force. Half the soldiers were South Sudanese and 26 percent Congolese, with only 24 percent