Anti-communist sentiment refers to the widespread fear, distrust, and opposition to communism and communist ideology, particularly prevalent in the United States during the Cold War. This sentiment shaped domestic and foreign policies, influencing actions such as military interventions and the establishment of security doctrines aimed at containing the spread of communism. The Korean War and the implementation of NSC-68 were significant manifestations of this anti-communist stance, reflecting the urgency to combat perceived communist threats globally.