A Red Scare is a form of moral panic provoked by fear of the rise of left-wing ideologies in a society, especially communism and socialism. Historically, red scares have led to mass political persecution, scapegoating, and the ousting of those in government positions who have had connections with left-wing movements. The name is derived from the red flag, a common symbol of communism and socialism.
Interesting. Of course Russia and China do this all the time.