There were forms called Alien Registration Forms that any person who originated from an Axis Power nation had to fill out. They contained questions like "country of origin," "how long have you lived in the United States," and others like an immigration form. Citizens had to fill this out, even if they had lived in the US for generations. I had just seen one for an Italian woman who lived in Pittsburgh for 37 years, yet still had to fill one out. Those who had to fill these out felt discriminated, and understandibly so. The idea behind it was to unsure that foreigners wouldn't sabotage the war effort or cause any other problems.

Hello! Recent History graduate with a focus in Italian History. Actually, when it was announced that Mussolini had declared war on Ethiopia in 1936, there are several accounts and instances noted of fights breaking out between African Americans and Italian Americans. Many African Americans take pride in the fact that during the age of colonialism and imperialism in the 19th century, the fierce warriors of Ethiopia managed to resist invasion whereas other African countries fell to the Dutch, German, British, etc. It infuriated African Americans that Ethiopia, famous for its resistance, had been targeted by Mussolini, and I'm sure the Italian-Americans who were sympathetic to the Fascist Party were aggressors in the fights as well. Link with further info: https://tezetaethiopia.wordpress.com/2005/06/18/black-americans-and-italo-ethiopian-relief-1935-1936/