A 1979 counter-invasion ordered by Julius Nyerere saw the army of Tanzania drive him out, leading to his replacement by the man he had earlier deposed, Milton Obote.  
One of his earlier purges targeted members of the Lango and Acholi tribes in the army, most of whom supported his main political rival.  During his rise to power, he gained goodwill by dissolving the secret police and ordering a state funeral for King Freddie; though when he ruled, his home at the Nile Mansions hotel became an infamous center of torture and executions.  A 1979 counter-invasion ordered by Julius Nyerere saw the army of Tanzania drive him out, leading to his replacement by the man he had earlier deposed, Milton Obote.  FTP, name this former dictator of Uganda.
One of his earlier purges targeted members of the Lango and Acholi tribes in the army, most of whom supported his main political rival.  
Idi Amin Dada Oumee.