Answer:
The Second Red Scare—a period of heightened fear about communism and its spread throughout the world—was closely linked to US involvement in the Korean War. Following the conflict between North and South Korea, the US government became increasingly concerned about the potential spread of communism in other countries in the region, leading to more aggressive attempts to root out communist sympathizers in the US and abroad. This fear also increased the level of paranoia around communist sympathizers and caused a crackdown on those perceived as having pro-communist leanings.