Idi Amin's short-lived regime in Uganda never achieved the stability necessary for authoritarian control.
Idi Amin is probably the best-known ruler in the history of Uganda, but his regime lasted only eight years, from 1971 to 1979. It began with a military coup, into which Amin was forced because he believed that the president, Milton Obote, was about to have him arrested. Amin initially presented the coup as an interim measure, promising to hold elections. After a week, however, he declared himself president, and it quickly became apparent that he intended to rule as a dictator.
The brutality of Amin's regime in Uganda was matched by and linked to its instability. His expulsion of all the Asian citizens of the country in 1972 led to a predictable economic collapse that undermined his rule almost from the start. It would be reasonable to say that the extreme authoritarianism of Amin's regime was the main factor that prevented him from achieving control where a more moderate leader might have succeeded.