Please forgive me for going off-topic and for asking a personal question (and please don't answer if it's too personal), but how did the government inform your grandfather that his movement was restricted during WWII?
Did he receive some sort of notice from the FBI?
I'm sorry that our government chose to restrict the civil liberties of a very important member of his community during WWII on the basis of his ethnicity.
A cautionary tale for today's America.