Disinformation was seen as an appropriate tool of politics and rhetoric in ancient Greece. Most of all persuasion was used, which then was considered a type of art.
Religion was (and in many ways still is) the best disinformer or manipulator; prophecies were constructed to manipulate the population. The important thing was to use emotions and more than anything else fear as a tool for manipulation. If the oracle of Delphi said a war was to fight and would be won, then the Greek population - because of religious motives - was prepared to fight that war.
Propaganda was not only used in wars but also in daily life to bring people together and create a nation.
But poets, playwrights and other artists were manipulating as well. Their pieces of literature and plays were full of political messages with different ideologies behind. In the way how theatre at that time was part of life, it can be understood easily that those messages had not only entertainment's character but also a lot of political and social influence.
A different and very famous part of disinformation in ancient Greek history was the story of
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Boris Yeltsin was Russian President until the end of 1999. After many years of work for the Communist Party, he joined the Politburo in 1986. His sharp critique on Mikhail Gorbachev forced that one to resign. Yeltsin won the 1990 election into Russian presidency and quit the Communist Party. Quarrels with the Parliament could not destroy his popularity until the secession war with Chechnya. When the Russian economy collapsed in 1998, he dismissed his entire government. In the end the sick old man of Russian politics had lost all his popularity as a president and resigned for the benefit of his political son Vladimir Putin.