Why did President Truman come to believe that the danger posed by American Communists was far bigger than their numbers?

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Truman came to believe that the danger posed by American Communists was far bigger than their numbers due to a series of sensational spy scandals, such as the Alger Hiss case and the Julius and Ethel Rosenberg case. These scandals caused public hysteria and led to a widespread belief that Soviet spies were infiltrating the US government and military. This belief was further fueled by the fact that both the Soviet Union and the US had acquired nuclear weapons by this time, creating a heightened sense of security and paranoia.

Why Did President Truman Come to Believe That the Danger