Answer :

taskmasters
In 1920's, people reveal distrust of others in many ways these are by :

Palmer Raids-Fed govt raids
FBI creation-J.Edgar Hoover
Quota system 1921
Sacco & Vanzetti Trial
ACLU which was created to oppose all constitutional violations

Hope this answers the question. Have a nice day.
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. 

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