Respuesta :
One reason that anti-immigrant hysteria swept the nation was because "Immigrants were associated with anarchism and communism," since during the Cold War there was a sweeping paranoia over a communist "takeover" of the United States.
I believe the answer is: Immigrants were associated with anarchism and communism
During that period, united states was involved in the cold war against the Soviet Union. At that time, most people were scared that the agents from communist countries could come into united states through immigration process, which create the anti-immigration hysteria.