Conspiracy theory is a school of thought that believes that a government, organization, or individual carries out a certain plan or policy at a particular time or region for personal gain or political motives. The representatives of conspiracy theories included: Karl and Frederick Engels: One of the founders of the theory of Marxists, they believe that there is a possibility of conspiracy theories in capitalist society, and that the government exists to protect its own interests. 2 William James: British philosopher and mathematician. He proposed the concept of "conspiracy theory" and believed that the government and capitalist society existed to achieve specific purposes. 3 Herbert Simon: American management scholar. He believes that the behavior of enterprises and governments exists for their own interests, which also reflects the conspiracy theory. 4 Thomas More: British mathematician and logician. He proposed the concept of "conspiracy theory" and believed that the actions of the government were for private interests and the needs of governance. These representatives all emphasized the conspiracy theory that the government or organization implemented a certain plan or policy in a certain area or period for private interests or political motives.