Answer;
"Red scares" - spies
In the 1920's people reveled distrust of others as Red scares- spies.
Explanation;
Red scare is the promotion of widespread fear by a state or a society about a potential rise of Communism, anarchism, or radical leftism. It first occurred immediately after the world war I, 1919-1920, when many in the United States feared recent immigrants and dissidents, particularly those who embraced communist, socialist, or anarchist ideology.