Propaganda
Propaganda was an untruthful message that was used, especially in times of war and by totalitarian governments, to influence the opinions of a populace.

Propaganda was used by both the Denobulans and the Antarans during the various wars between the two. ()

The film News on Parade was released in an alternate 1944 that promoted a prosperous alliance between Germany and America. ()

In 2151, Tolaris claimed that the Vulcan primal nature had been exaggerated by propaganda, in an attempt to dissuade the Vulcan people from looking deeper into it. ()

In 2152, the spread of propaganda on an unnamed pre-warp planet was interpreted by the crew of  that a war was coming between two countrys. ()

In 2155 in the mirror universe, when Lieutenant and captain's woman  told Captain Maximilian Forrest that she had heard the battle at Tau Ceti had gone well, Forrest replied that she had been listening to propaganda and that the battle had actually gone very badly. ()

In 2268, a newsreel was publicly shown on the planet Ekos to its populace, demonstrating the buildup of its armed forces. The newsreel was clearly an attempt by the Ekosian leadership to engender enthusiasm for the upcoming campaign against its persecuted minority, the Zeons. ()

Propaganda produced by the Klingon Empire in the 23rd century claimed that the United Federation of Planets committed atrocities against its prisoners, placing them in death camps and torturing them for their scientific and military secrets. ()

Romulan propaganda claimed that Starfleet was weak and stupid. ()

The Klingon-Cardassian Alliance used propaganda and Benjamin Sisko once referred to the Alliance as having a "propaganda machine". ()

The Cardassian Union has used propaganda to influence its citizens for a long time. Propaganda was often broadcast over large viewscreens. Dukat's first speech as the leader of the Cardassian Union was shown in such a way. ()

In 2373, Kira Nerys hoped that Tekeny Ghemor would be able to "issue corrections" to the propaganda of the Cardassian Union. Unfortunately, Ghemor died of Yarim Fel Syndrome soon after he visited Kira on Deep Space 9. ()  

In early 2374, Jake Sisko was concerned that instituting Weyoun's proposed changes to his Federation News Service articles would make them "Dominion propaganda". Weyoun claimed that he "would never dream of asking" him to write such a thing. ()

See also 
 Disinformation
 Lie

External link 
 

de:Propaganda
fr:Propagande
Communication