Over 1500 Italian Americans designated “enemy aliens” by the FBI were arrested in WWII. About 250 of these were interned for up to two years in military camps in Montana, Oklahoma, Tennessee and Texas. In October 1942, after strong protests by Italian-American trade unions, labor councils and a sympathetic press, 600,000 unnaturalized Italians living in the United States were freed from the stigma of being alien enemies. They were now allowed to travel freely, own cameras and firearms, and were not required to carry ID cards. After Italy’s surrender in September 1943, most of the remaining Italian American internees were released.
The Italian Historical Society of America website describes the internment of Italian Americans in WWII.