China and Russia immediately come to my mind. China has been influencing american public opinion in more than subtle ways. Hollywood movies are forced or incentivises to show china is positive light. Any material manufactured in China is forced to adopt Chinese world view for example China secretly forces printers to make changes to how Taiwan or Tibet is mention in the books. NN Taleb's recent book face the same issue.
The problem with CIA or US Government in general has been they have long stopped using american ideas of freedom, transparency to their own advantage while being transparent and accountable to public. Constant lies, optimising for dubiously useful goals, financial mismanagement etc. has made them less credible and very correctly so.
I bet the next thing CIA would try to get Assange killed and facts suppressed only making themselves less and less credible and reducing freedom in the country.
When John Kennedy appeared on television during Cuba missile crisis the American public to a large extent believed their president. After what Bush did in Iraq I think American public will not trust another President like that even in the face of a real crisis.
I think that is how nations probably fail.