What caused the Red Scare of the 1940s and 1950s?

Related questions

1. Is communism a form of anarchism?
2. What is the anarchy movement?
3. What is an anarchist government?
4. Was Max Stirner an anarchist?
5. What does an anarchist want?
6. What does anarcho capitalist mean?
7. What does an anarchist believe?
8. Did anarchism work Spain?
9. Is being a sovereign citizen legal?
10. Are there illegal books in USA?

Tags

1. #scare
2. #posed
3. #soviet
4. #union
5. #government
6. #between
7. #perceived
8. #states
9. #early
10. #profound
11. #became
12. #actions
13. #hysteria
14. #range
15. #intensified
16. #effect
17. #communists
18. #society
19. #1950s
20. #known
21. #threat
22. #1940s
23. #enduring
24. #united