How did the post - World War 2 red scare compare and contrast with the one that followed world war 2?

The post-World War I Red Scare (1917-1920) was primarily driven by fears of communism and anarchism, resulting in widespread paranoia, labor strikes, and the Palmer Raids targeting alleged radicals. In contrast, the post-World War II Red Scare (late 1940s-1950s) was fueled by the geopolitical tensions of the Cold War and the fear of Soviet espionage, leading to McCarthyism and aggressive investigations into alleged communist infiltration in government and society. While both periods involved heightened fears of communism, the latter was more institutionalized, with significant impacts on domestic policy and civil liberties. Both eras shared a common theme of paranoia but differed in their contexts and the methods used to address perceived threats.