My good friend Jerry Brewer wrote a very interested and well documented article The Death of a Chilean Spy Chief, Operation Condor and the CIA.   The article delves into the destructive work of  General Manuel Contreras who worked as spy for the CIA.  He  was the founder of one of the most violent and  criminal operations in Chile known as (DINA), under the brutal dictatorship of Augusto Pinochet, and with the approval of the CIA.  

There aren't any differences when it comes to dictators either from the right or from the left. They are both criminal and brutal against it's citizens.