Sorry, are you suggesting that the CIA hasn’t done its best to prevent left-wing governments from succeeding in many cases? Because that would be very silly and ahistorical.
Everyone remembers evil Pinochet who killed some 3k out of 11 million, nobody cares about kind Hoxha who killed at least 6k (likely closer to 100k) out of 2 million, or plushy Castro (10k killed + 70k dead trying to flee out of 10 million).