In article , Robert Casey
writes:

Ya think a spy would apply for a license in ANY radio service, Jim?

Depending on the situation, a ham license could be a good
"cover story" for a spy with transmitting equipment. The
FCC did shut down all ham bands during WW2...

During WW1, too. In fact, during WW1, all amateur radio equipment had to be
disabled - receiving as well as transmitting.

In 1940, more than a year before Pearl Harbor, all US hams were required to
either take a loyalty oath or turn in their licenses.

73 de Jim, N2EY