In the series, Garak is an exiled spy from the Cardassian Union and a former member of the feared Cardassian intelligence group called the Obsidian Order.
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At one point, Doctor Bashir told him the story of "The Boy Who Cried Wolf" and upon hearing the moral ("no one believes a liar when he is telling the truth"), Garak insisted that the true moral was "you should never tell the same lie twice".