After World War II the importance of propaganda still increased, on the commercial level as well as on a political level, in the era of the Cold War. The propaganda institutions of the different countries wanted their people to think the right way, which meant, the national way. In the USA the McCarthy-era started, a totalitarian system in struggle against communism.
Cold War brought the era of spies with it, which was the perfect tool of disinformation. But the topic as a movie-genre seems still popular today, as the unchanged success of James Bond-movies show.
A huge net of propaganda was built up for threatening with the nuclear bomb: pretending that the enemy was even more dangerous than the effect of such a bomb.
And later, after the fall of the Iron Curtain, disinformation found other fields of work, like the wars of the 1990s showed us.
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Headquarters of the US National Security Agency in Maryland.
U.S. intelligence agency within the Department of Defense that is responsible for cryptographic and communications intelligence and security. The NSA grew out of the communications intelligence activities of U.S. military units during World War II. The NSA was established in 1952 by a presidential directive and, not being a creation of the Congress, is relatively immune to Congressional review; it is the most secret of all U.S. intelligence agencies. The agency's mission includes the protection and formulation of codes, ciphers, and other cryptology for the U.S. military and other government agencies, as well as the interception, analysis, and solution of coded transmissions by electronic or other means. The agency conducts research into all forms of electronic transmission. It operates posts for the interception of signals around the world. Being a target of the highest priority for penetration by hostile intelligence services, the NSA maintains no contact with the public or the press.