The red scare was the government using propaganda to trick the public into thinking that communists were all around them and that they were trying to manipulate the rest of the public. Many people would accuse random people, its similar to the Salem witch trials. The red scare had people scared to the point where the goverment was making safe bonkers for people to go to if they were in public. The U.S. government also made educational videos and talks and showed them to the public be for movies or during TV commercials. The government even made a mascot for teaching the public how to hide. "Bert The Turtle" was the mascot, they said things like "he's smart he wears his shelter on his back, you must be able to find shelter as well"
I have posted a link below to show some propaganda and examples of the videos they would show in the late 40's and early 50's:
https://www.youtube.com/watch?v=IKqXu-5jw60