After World War II,  what came next was countries hiring agents to spy on one another in hopes of discovering and getting information about plans, tactics, weapons, and whatever intelligence reports they could get. Whether to get ahead of the other nations that posed a threat or just for the peace of mind that they won’t be surprised by a nuke one day, espionage agents became their countries’ secret weapons.

Double agents became a thing, too. Those spies pretended to work against the nation they were really loyal to, so they could get the juiciest of information, although some just betrayed their country. Here are the six who did:

Aldrich Ames

Aldrich Ames
Aldrich Hazen Ames; former CIA officer convicted of espionage. (Source: staff, Federal Bureau of Investigation/Wikimedia)

Aldrich Hazen Ames was one of the most infamous CIA traitors in the country. Nevertheless, he began his journey in the CIA. He had no plans of joining the organization, but after getting an outstanding GS-7 rating and high performance during his tests, he was accepted into the Career Trainee Program. He was assigned to various projects, but it was in his 1976 stint in New York that he started interacting with Soviet assets. During this mission, he received praises from the organization and even got promoted to one of the highest-ranking officers in his pay grade.

As he became increasingly involved in Russian intelligence in 1985, Ames was one of the officers assigned to assess Soviet embassy officials. CIA was looking to find potential intelligence assets at the time when the Russian offered him $50,000 for information.