How was the second Red Scare following the culmination of World War II related to the Truman Doctrine?

Truman’s last years in office were marred by charges that his administration was lax about, or even condoned, subversion and disloyalty and that communists, called “reds,” had infiltrated the government. These accusations were made despite Truman’s strongly anticommunist foreign policy and his creation, in 1947, of an elaborate Federal Employee Loyalty Program, which resulted in hundreds of federal workers being fired and in several thousand more being forced to resign.

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