Wiktionary
n. propaganda disseminated as a response and opposition to other propaganda.
Wikipedia
Counterpropaganda is a form of communication consisting of methods taken and messages relayed to oppose propaganda which seeks to influence action or perspectives among a targeted audience. It is closely connected to propaganda as the two often employ the same methods to broadcast methods to a targeted audience. Counterpropaganda differs from propaganda as it is defensive and responsive to identified propaganda. Additionally, counterpropaganda consists of several elements that further distinguish it from propaganda and ensure its effectiveness in opposing propaganda messages.
Usage examples of "counterpropaganda".
They had even launched a counterpropaganda campaign, arguing that this demonic activity indicated that the evil Semman king had joined forces with powers of darkness and had to be stopped before he became more powerful.