Question

Who replaced the "hun" or german as the object of american hatred?

Answer 1

Answer is: new object of American hatred was Communists (Reds).
"Red Scare" is promotion of widespread fear by a society or state about a potential rise of communism. There were two periods in the history of the United States with this name, first after World War I and second after World War II.

Answer 2

The Reds, also known as Communists, replaced the Hun as the object of American hatred. Before its wide usage in the time of World War (both I and II), the Huns were originally nomads who has a great contribution to the fall of the Roman Empire and triggered mass evacuation of Germanic tribes. Under the reign of Attila the Hun, they terrorized the Italy and fought Germanic tribes.