What were FBI agents told never to stand on when meeting J. Edgar Hoover

OK, I'll take a guess: the FBI seal in the front entrance floor to the FBI building in Washington, D.C.

Erm, do you know the answer to this temunah4u?

Apparently it was his shadow!

J. Edgar Hoover did not like anybody walking on his shadow. We don't know if it was a superstition, or some security precaution that he took, but it was well known in the F.B.I.; if there was a light casting a shadow on Hoover, don't step in it.