In February 1942, President Roosevelt signed Executive Order 9066 authorizing the forced removal and incarceration of all people of Japanese ancestry on the West Coast. However, from December 1941 to April 1942, the Justice Department arrested and detained 1,490 Issei or first generation Japanese immigrants at Tuna Canyon. These innocent people were fisherman, priests and pastors, judo instructors, bankers, Japanese language school teachers, and other community leaders who were wrongly suspected of subversive activities. They were imprisoned at Tuna Canyon before being sent to other detention, internment or incarceration camps in the United States. The Tuna Canyon camp processed more than 2,500 individuals, predominantly Japanese, as well as Germans, Italians and Japanese Peruvians.