what term describes the u. s. attorney general's hunt for communists, socialists, and anarchists in the 1920s?

The term ‘Red Scare’ described the U.S. Attorney General’s hunt for communists, socialits, and anarchitsts in 1920’s.  

Explanation:

The colour red was closely associated with the communists because of their allegiance with the red-coloured Soviet Union flag.  

The World War I resulted in a lot of nationalistic but anti-immigrant feelings which instigated the communists. The aftermath of  World War I lead to severe unemployment which led to the formation of labor strikes again triggered by the communists. Such factors which led the communists to revolt against the government.

With the raise of the revolutionary communists like the Bolsheviks who overtook the Russian government; a lot of fear spread of communists like them taking over the U.S. government also.

All these immensely led to a hysterical fear of the communists and a resentment to the red color associated with them.  

It was Attorney General, Mitchell Palmer who raised the alarm and led the Red Scare movement in the 1920s. Intense raids were conducted in search of communists and those who spoke about communism or anarchism. His main aim was to deport the radical immigrants from the U.S.A.  

sounds good to me mate!