Tamerlane (April 8, 1336–February 18, 1405) was the ferocious and terrifying founder of the Timurid empire of Central Asia, eventually ruling much of Europe and Asia. Throughout history, few names have inspired such terror as his.
They could have kept a close eye on those they deemed suspicious, and even while there were many Japanese Americans, the government could have American citizens report any suspicious behavior that they viewed from their Japanese American neighbors.