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
Hafizullah Amin did not participate in the meeting. This, according to Beverley Male, "suggested that some plot against Amin was in preparation". Taraki was instructed to stop-over in Moscow, where the Soviet leaders urged him to remove Amin from power as per the KGB's decision, because Amin posed danger. Amin's trusted aid, Daoud Taroon, informed Amin of the meeting and the KGB's plan. In Kabul, Taraki's aides, the Gang of Four (consisting of Watanjar, Mazdoryar, Gulabzoi and Sarwari), planned a plot to assassinate Amin, but it failed as Amin was informed of this. Within hours of Taraki's return to Kabul on 11